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Evidence record

Would evolution repeat if it ran again?

Every sentence on the exploration belongs to at least one claim below. Each says what kind of statement it is, what it rests on, what the evidence does not establish, and how far it was checked. Nothing here is a score, and none of it is a verdict on a belief or a theory.

Last checked 24 September 2026.

  • Source checked: 35
  • A judgement, not a fact: 12
  • Partly checked: 3
  • Presented as open: 1

If something here is wrong, misquoted, out of date or unfair, write to support@unknownoceans.com and give the claim number, which does not change.

What the question takes for granted

A scientific question about how far evolution repeats itself. The page answers it with one long experiment on bacteria, one review of convergence in nature and one forecasting method for influenza, and says what each can and cannot carry.

  • Evolution can be run again from the same starting point

    Established

    Not for the history of life, which cannot be replayed, but for bacteria kept frozen at intervals, which can be revived and evolved again. That is what the replay experiments did.

  • Repeatability and contingency are alternatives

    Contested

    The page argues they are not: parallel change and history-dependent change both occurred in the same experiment, and the question is how much of each.

  • What happens in flasks of bacteria says something about the history of life

    Open

    The experiment was built to test contingency under controlled conditions, which is also what limits how far it generalises. The page presents the scale-up as unanswered.

How the question is labelled

Claim: The same tape, twice

Kind
Framing. Signposting. It asserts nothing a source could check.

The title borrows the image of replaying the tape of life, which the page explains in its opening.

Claim: Replaying

Kind
Framing. Signposting. It asserts nothing a source could check.

The question

Claim: Twelve identical populations of bacteria have been running the same experiment since 1988.

Kind
Historical claim. A statement about the past that historical evidence can test.
Review
Source checked. The cited passage was read, and it says this.

Identical at the start: the populations were founded from one clone and differ only by a neutral marker that tells six from the other six.

Claim 3 · checked 24 September 2026 · AI-assisted audit

Claim: One of them did something the others never did.

Kind
Observation. Something measured or seen, as the named source reports it.
Review
Source checked. The cited passage was read, and it says this.

The thing it did is use citrate for growth in the presence of oxygen.

Later work looked for

Europe PMC, 2012 on, "long-term evolution experiment" and citrate: Leon and colleagues (2018) report citrate use still in only one of the twelve populations after 30 years and find more than one potentiating step; Van Hofwegen and colleagues (2016) dispute the rarity. Both added and the page updated.

Claim 4 · checked 24 September 2026 · AI-assisted audit

Claim: Evolution repeats itself constantly at small scales, which makes it partly predictable.

Kind
This page’s reading. A judgement the page makes from the evidence. Others read it differently.
Review
A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.

The page’s summary of the parallel changes in the experiment and of convergence in nature, both covered and sourced below.

Claim 5 · checked 24 September 2026 · AI-assisted audit

Claim: It also depends on history in ways that can be tested experimentally

Kind
This page’s reading. A judgement the page makes from the evidence. Others read it differently.
Review
A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.

Corrected

24 September 2026. Previously: “It also depends on history in ways that can be demonstrated experimentally, and the experiment that demonstrates it best” What the citrate experiment demonstrates is disputed (Van Hofwegen and colleagues, 2016), and the page now reports the dispute; the summary no longer settles it.

Claim 6 · checked 24 September 2026 · AI-assisted audit

Claim: and the experiment that tests it best

Kind
This page’s reading. A judgement the page makes from the evidence. Others read it differently.
Review
A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.

The page’s judgement. The authors present it as a direct test of contingency; the page reports below that others dispute what it shows.

Claim 7 · checked 24 September 2026 · AI-assisted audit

Claim: took twenty years and thirty thousand generations

Kind
Historical claim. A statement about the past that historical evidence can test.
Review
Source checked. The cited passage was read, and it says this.

The innovation appeared after about 31,500 generations; the paper that tested it by replay was published twenty years into the experiment.

Claim 8 · checked 24 September 2026 · AI-assisted audit

Claim: The thought experiment is old: rewind life to some point in the distant past, let it run again, and see whether anything recognisable appears.

Kind
Historical claim. A statement about the past that historical evidence can test.
Review
Source checked. The cited passage was read, and it says this.

The thought experiment is Stephen Jay Gould’s replay of the tape of life.

Corrected

24 September 2026. Previously: “rewind life to the beginning, let it run again” Gould’s thought experiment, as the cited paper states it, replays the tape from some point in the distant past, not from the beginning of life.

Claim 9 · checked 24 September 2026 · AI-assisted audit

Claim: It stopped being only a thought experiment when someone started twelve identical populations and kept them going for decades.

Kind
Historical claim. A statement about the past that historical evidence can test.
Review
Source checked. The cited passage was read, and it says this.

The someone is Richard Lenski, whose laboratory founded the populations.

Claim 10 · checked 24 September 2026 · AI-assisted audit

What was measured

Claim: What was measured

Kind
Framing. Signposting. It asserts nothing a source could check.

The experiment

Claim: The experiment

Kind
Framing. Signposting. It asserts nothing a source could check.

Claim: Since 1988, twelve populations of the same bacterium have been grown in the same medium, transferred daily, with samples frozen every 500 generations.

Kind
Historical claim. A statement about the past that historical evidence can test.
Review
Source checked. The cited passage was read, and it says this.

Claim 13 · checked 24 September 2026 · AI-assisted audit

Claim: The frozen samples are a living fossil record that can be revived and replayed.

Kind
Observation. Something measured or seen, as the named source reports it.
Review
Source checked. The cited passage was read, and it says this.

Later work looked for

Europe PMC, 2012 on, "long-term evolution experiment": later work, including Leon and colleagues (2018), still revives archived clones; nothing that changes it.

Claim 14 · checked 24 September 2026 · AI-assisted audit

Claim: Much of what happened was parallel. All twelve grew larger cells, all twelve improved their growth rate, and the same genes were hit repeatedly across independent lines.

Kind
Observation. Something measured or seen, as the named source reports it.
Review
Source checked. The cited passage was read, and it says this.

What this does not establish

Parallel at the level of genes, not of individual mutations: the exact changes almost always differ between populations.

Later work looked for

Europe PMC, 2012 on, "long-term evolution experiment": Leon and colleagues (2018) report further genes changed in all or nearly all populations; nothing that changes it.

Claim 15 · checked 24 September 2026 · AI-assisted audit

Claim: At that level evolution is repeatable and to a degree predictable.

Kind
This page’s reading. A judgement the page makes from the evidence. Others read it differently.
Review
A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.

Follows from the parallel changes in the sentence before; "to a degree" is carried by the divergence the same paper reports.

Claim 16 · checked 24 September 2026 · AI-assisted audit

Improvement that has not stopped

Claim: Improvement that has not stopped

Kind
Experimental result. What an experiment or trial found, under its own conditions. A result in animals, cells or a simulation is not a result in people.
Review
Source checked. The cited passage was read, and it says this.

What this does not establish

Through 60,000 generations, in the nine populations that could be measured.

Later work looked for

Crossref and Europe PMC, 2016 on, "long-term evolution experiment" fitness trajectory and power law: no later measurement of the fitness trajectory that changes it.

Corrected

24 September 2026. Previously: “Improvement that does not stop” The data run to 60,000 generations. A curve without a ceiling fits them better, which is not a demonstration that improvement never stops; the paper itself says "indefinitely–or at least for a long time".

Claim 17 · checked 24 September 2026 · AI-assisted audit

Claim: A 2015 analysis of the same populations addressed a simpler question: does adaptation run out.

Kind
Historical claim. A statement about the past that historical evidence can test.
Review
Source checked. The cited passage was read, and it says this.

The 2015 paper tested a prediction made by an earlier study of the first 50,000 generations.

Claim 18 · checked 24 September 2026 · AI-assisted audit

Claim: The expectation was that fitness would approach a ceiling as the easy improvements were used up.

Kind
What scholars argue. A report of what specialists argue, or where they disagree.
Review
Source checked. The cited passage was read, and it says this.

Claim 19 · checked 24 September 2026 · AI-assisted audit

Claim: Not yet. In all nine populations measured, fitness was still rising between forty and sixty thousand generations, more slowly than before

Kind
Experimental result. What an experiment or trial found, under its own conditions. A result in animals, cells or a simulation is not a result in people.
Review
Source checked. The cited passage was read, and it says this.

What this does not establish

Six of the nine rose significantly in both ten-thousand-generation intervals and three in only one; the rise over the whole twenty thousand is significant in all nine.

Later work looked for

Crossref and Europe PMC, 2016 on, "long-term evolution experiment" fitness trajectory and power law: nothing that changes it.

Corrected

24 September 2026. Previously: “It does not. Fitness continues to rise after fifty thousand generations, more slowly but without any sign of a limit” The paper measured nine populations to 60,000 generations. That shows fitness had not stopped rising, not that it never will, and "without any sign of a limit" stated a model comparison as an observation.

Claim 20 · checked 24 September 2026 · AI-assisted audit

Claim: and the trajectories are better described by a curve with no ceiling than by one with one.

Kind
What a model says. What a theory or model predicts or describes, which is not the same as what has been observed.
Review
Source checked. The cited passage was read, and it says this.

What this does not establish

A better fit between two models, not proof that no ceiling exists. The authors themselves write "or at least for a long time".

Claim 21 · checked 24 September 2026 · AI-assisted audit

Claim: Those nine did not include the one that did something unusual, which was left out of the measurements.

Kind
Historical claim. A statement about the past that historical evidence can test.
Review
Source checked. The cited passage was read, and it says this.

Corrected

24 September 2026. Previously: “That is a result about all twelve lines rather than about the one that did something unusual, and it is the more general finding of the two.” The 2015 paper measured nine of the twelve populations and excluded three, including the one that evolved citrate use.

Claim 22 · checked 24 September 2026 · AI-assisted audit

Claim: It is a result about ordinary adaptation, and the more general finding of the two.

Kind
This page’s reading. A judgement the page makes from the evidence. Others read it differently.
Review
A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.

The page’s judgement: the fitness result covers nine populations adapting to the same medium, the citrate result one population and one trait.

Claim 23 · checked 24 September 2026 · AI-assisted audit

And one population did something else

Claim: And one population did something else

Kind
Observation. Something measured or seen, as the named source reports it.
Review
Source checked. The cited passage was read, and it says this.

Later work looked for

Europe PMC, 2012 on, "long-term evolution experiment" and citrate: Leon and colleagues (2018) report citrate use still in only one of the twelve populations after 30 years and find more than one potentiating step; Van Hofwegen and colleagues (2016) dispute the rarity. Both added and the page updated.

Claim 24 · checked 24 September 2026 · AI-assisted audit

Claim: The growth medium contains citrate, which this bacterium is characteristically unable to use in the presence of oxygen.

Kind
Observation. Something measured or seen, as the named source reports it.
Review
Source checked. The cited passage was read, and it says this.

What this does not establish

A few strains isolated from farms and clinics use citrate, carrying genes acquired from other species on plasmids, and one earlier laboratory mutant was reported.

Later work looked for

Europe PMC, 2012 on, E. coli aerobic citrate: Van Hofwegen and colleagues (2016) begin from the same fact ("E. coli cannot use citrate aerobically"); nothing that changes it.

Claim 25 · checked 24 September 2026 · AI-assisted audit

Claim: After more than thirty thousand generations, one population began using it, and its population size jumped.

Kind
Observation. Something measured or seen, as the named source reports it.
Review
Source checked. The cited passage was read, and it says this.

The first variant used citrate weakly; the jump in population size came about two thousand generations later, after further mutations improved it.

Later work looked for

Europe PMC, 2012 on, "long-term evolution experiment" and citrate: Leon and colleagues (2018) report citrate use still in only one of the twelve populations after 30 years and find more than one potentiating step; Van Hofwegen and colleagues (2016) dispute the rarity. Both added and the page updated.

Claim 26 · checked 24 September 2026 · AI-assisted audit

Claim: The key result came from replaying the tape.

Kind
This page’s reading. A judgement the page makes from the evidence. Others read it differently.
Review
A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.

The page’s judgement of which part of the paper matters most.

Claim 27 · checked 24 September 2026 · AI-assisted audit

Claim: Clones revived from the frozen samples re-evolved the ability only if they had been taken at generation 20,000 or later

Kind
Experimental result. What an experiment or trial found, under its own conditions. A result in animals, cells or a simulation is not a result in people.
Review
Source checked. The cited passage was read, and it says this.

What this does not establish

Three replay experiments, seventeen independent mutants in all. Even from later clones the ability arose rarely.

Later work looked for

Europe PMC, 2012 on, "long-term evolution experiment" and citrate: Leon and colleagues (2018) report citrate use still in only one of the twelve populations after 30 years and find more than one potentiating step; Van Hofwegen and colleagues (2016) dispute the rarity. Both added and the page updated.

Corrected

24 September 2026. Previously: “Restarting from frozen samples showed that the innovation only arose from populations descended from a particular point in that lineage’s history: an earlier mutation, harmless on its own, had made the later one possible.” The replays started from single clones, not populations. The 2008 paper did not identify the potentiating change and says it did not know whether it was beneficial, neutral or deleterious, so "harmless on its own" was unsupported; later work (Leon and colleagues, 2018) finds more than one change and a first step whose benefit changed over time.

Claim 28 · checked 24 September 2026 · AI-assisted audit

Claim: something earlier in that lineage’s history had made the step far more likely.

Kind
Hypothesis. A proposed explanation, not an established one.
Review
Source checked. The cited passage was read, and it says this.

What this does not establish

The authors’ inference from the replays. The 2008 paper did not identify the change.

Other readings

Van Hofwegen, Hovde and Minnich argue that the rarity reflects the experiment’s conditions rather than the lineage’s history.

Claim 29 · checked 24 September 2026 · AI-assisted audit

Claim: Later work found more than one such change.

Kind
Experimental result. What an experiment or trial found, under its own conditions. A result in animals, cells or a simulation is not a result in people.
Review
Source checked. The cited passage was read, and it says this.

What this does not establish

Leon and colleagues infer this from where on the family tree the replayed clones sat; the individual mutations are candidates, not all confirmed.

Later work looked for

Europe PMC, 2012 on, "long-term evolution experiment" and citrate: Leon and colleagues (2018) report citrate use still in only one of the twelve populations after 30 years and find more than one potentiating step; Van Hofwegen and colleagues (2016) dispute the rarity. Both added and the page updated.

Claim 30 · checked 24 September 2026 · AI-assisted audit

Claim: The first step toward using citrate was slightly beneficial even in the ancestor, became harmful as other mutations accumulated, and was beneficial again by generation 29,000.

Kind
Experimental result. What an experiment or trial found, under its own conditions. A result in animals, cells or a simulation is not a result in people.
Review
Source checked. The cited passage was read, and it says this.

  • Supports

    Innovation in an E. coli evolution experiment is contingent on maintaining adaptive potential until competition subsidesabstract; Discussion

    Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Research in microbes · Experiment

    The source reads: We found that there was already a slight fitness benefit for this mutation in the original ancestor ... the lineage in which Cit+ eventually evolved became ‘anti-potentiated’ ... it was deleterious to evolve rudimentary Cit+ in this genetic background ... further mutations appeared in the focal LTEE lineage by 29,000 generations

What this does not establish

Measured by adding the first-step mutation to clones from different generations and competing them in the experiment’s medium. One lineage, one trait.

Later work looked for

Europe PMC, 2012 on, "long-term evolution experiment" and citrate: Leon and colleagues (2018) report citrate use still in only one of the twelve populations after 30 years and find more than one potentiating step; Van Hofwegen and colleagues (2016) dispute the rarity. Both added and the page updated.

Corrected

24 September 2026. Previously: “” Added: the page’s account of a single harmless potentiating mutation was superseded by Leon and colleagues (2018).

Claim 31 · checked 24 September 2026 · AI-assisted audit

Claim: Its authors called it an explicit demonstration of historical contingency.

Kind
What scholars argue. A report of what specialists argue, or where they disagree.
Review
Source checked. The cited passage was read, and it says this.

Corrected

24 September 2026. Previously: “That is contingency demonstrated rather than argued.” The reading is disputed (Van Hofwegen and colleagues, 2016), so it is attributed to the authors who hold it, and the dispute is reported in the next paragraph.

Claim 32 · checked 24 September 2026 · AI-assisted audit

Claim: The same environment, the same organism, and an outcome that depended on what had already happened by generation 20,000.

Kind
Disputed. A contested point, where the page reports a side or the disagreement.
Review
A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.

Other readings

Van Hofwegen, Hovde and Minnich read the delay as a product of the experiment’s conditions rather than of the lineage’s history; the next paragraph reports both sides.

Corrected

24 September 2026. Previously: “and an outcome that depended on what had happened twenty thousand generations earlier.” The potentiating change arose by generation 20,000 and citrate use about 31,500, so it came about eleven thousand generations earlier, not twenty thousand.

Claim 33 · checked 24 September 2026 · AI-assisted audit

Claim: Not everyone reads it that way. Van Hofwegen, Hovde and Minnich selected directly for citrate use and got it within 12 to 100 generations, through the same class of mutation, and conclude that the rarity in the long experiment was an artefact of its conditions.

Kind
What scholars argue. A report of what specialists argue, or where they disagree.
Review
Partly checked. Only part of the source could be read. What was not read is listed.

  • Supports

    Rapid evolution of citrate utilization by Escherichia coli by direct selection requires citT and dctAabstract

    Cited · Link answered, 19 October 2026 · Abstract only, 24 September 2026 · Research in microbes · Experiment

    The source reads: Potentiation/actualization mutations occurred within as few as 12 generations, and refinement mutations occurred within 100 generations. ... These mutations were equivalent to the amplification and promoter capture CitT-activating mutations identified in the LTEE. ... We conclude that the rarity of the LTEE mutant was an artifact of the experimental conditions

What this does not establish

Only the abstract was read. Their selection used citrate-rich media in E. coli B and K-12, not the long experiment’s daily transfers in glucose.

Later work looked for

Europe PMC, 2012 on, "long-term evolution experiment" and citrate: Leon and colleagues (2018) report citrate use still in only one of the twelve populations after 30 years and find more than one potentiating step; Van Hofwegen and colleagues (2016) dispute the rarity. Both added and the page updated.

Corrected

24 September 2026. Previously: “” Added: the page presented contingency in this experiment as settled; a published rival reading exists and the authors’ side has answered it.

Claim 34 · checked 24 September 2026 · AI-assisted audit

Claim: Leon and colleagues answer that starving cells on citrate masks the dependence on genetic background that the long experiment exposes.

Kind
What scholars argue. A report of what specialists argue, or where they disagree.
Review
Source checked. The cited passage was read, and it says this.

The paragraph cites Van Hofwegen and colleagues among the studies it answers.

Claim 35 · checked 24 September 2026 · AI-assisted audit

Claim: What the replays showed

Kind
Framing. Signposting. It asserts nothing a source could check.

Claim: Later generations of one lineage produced the innovation repeatedly.

Kind
Experimental result. What an experiment or trial found, under its own conditions. A result in animals, cells or a simulation is not a result in people.
Review
Source checked. The cited passage was read, and it says this.

What this does not establish

Repeatedly, but rarely: seventeen independent mutants across three experiments.

Later work looked for

Europe PMC, 2012 on, "long-term evolution experiment" and citrate: Leon and colleagues (2018) report citrate use still in only one of the twelve populations after 30 years and find more than one potentiating step; Van Hofwegen and colleagues (2016) dispute the rarity. Both added and the page updated.

Claim 37 · checked 24 September 2026 · AI-assisted audit

Claim: Something in that lineage’s background made it far more likely.

Kind
Hypothesis. A proposed explanation, not an established one.
Review
Source checked. The cited passage was read, and it says this.

Other readings

Van Hofwegen, Hovde and Minnich attribute the rarity to the experiment’s conditions rather than to the lineage.

Corrected

24 September 2026. Previously: “Something in that lineage’s background made it reachable.” Leon and colleagues (2018) find the first step was possible, and slightly beneficial, even in the ancestor; what changed was how likely it was to appear and succeed.

Claim 38 · checked 24 September 2026 · AI-assisted audit

Claim: Earlier generations of the same lineage never did, in many replays.

Kind
Experimental result. What an experiment or trial found, under its own conditions. A result in animals, cells or a simulation is not a result in people.
Review
Source checked. The cited passage was read, and it says this.

Later work looked for

Europe PMC, 2012 on, "long-term evolution experiment" and citrate: Leon and colleagues (2018) report citrate use still in only one of the twelve populations after 30 years and find more than one potentiating step; Van Hofwegen and colleagues (2016) dispute the rarity. Both added and the page updated.

Claim 39 · checked 24 September 2026 · AI-assisted audit

Claim: Whatever it was had arisen by generation 20,000.

Kind
Hypothesis. A proposed explanation, not an established one.
Review
Source checked. The cited passage was read, and it says this.

What this does not establish

The first such change; later work finds another by generation 29,000.

Corrected

24 September 2026. Previously: “A potentiating mutation had to come first. The step was not available before it.” Leon and colleagues (2018) find the first step was available, and slightly beneficial, in the ancestor, and more than one change was involved; the 2008 paper supports only that potentiation had occurred by generation 20,000.

Claim 40 · checked 24 September 2026 · AI-assisted audit

Claim: The other eleven populations never did, in tens of thousands of generations.

Kind
Observation. Something measured or seen, as the named source reports it.
Review
Source checked. The cited passage was read, and it says this.

Later work looked for

Europe PMC, 2012 on, "long-term evolution experiment" and citrate: Leon and colleagues (2018) report citrate use still in only one of the twelve populations after 30 years and find more than one potentiating step; Van Hofwegen and colleagues (2016) dispute the rarity. Both added and the page updated.

Claim 41 · checked 24 September 2026 · AI-assisted audit

Claim: History shaped what came next, in an experiment designed to remove every other difference.

Kind
Disputed. A contested point, where the page reports a side or the disagreement.
Review
A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.

Other readings

Van Hofwegen, Hovde and Minnich read the outcome as shaped by the experiment’s conditions rather than by the lineage’s history.

Corrected

24 September 2026. Previously: “History constrains what is possible next, in an experiment designed to remove every other difference.” Leon and colleagues (2018) find the first step was possible from the start; history changed how likely it was, not whether it was possible.

Claim 42 · checked 24 September 2026 · AI-assisted audit

What it generalises to

Claim: What it generalises to

Kind
Framing. Signposting. It asserts nothing a source could check.

Claim: A frozen sample every five hundred generations is a fossil record you can restart.

Kind
Observation. Something measured or seen, as the named source reports it.
Review
Source checked. The cited passage was read, and it says this.

Later work looked for

Europe PMC, 2012 on, "long-term evolution experiment": archived samples are still revived in later work (Leon and colleagues, 2018); nothing that changes it.

Claim 44 · checked 24 September 2026 · AI-assisted audit

How much is contingency

Claim: How much is contingency

Kind
Framing. Signposting. It asserts nothing a source could check.

Claim: Convergence is common, perhaps ubiquitous: eyes, wings, echolocation and streamlined bodies have appeared repeatedly in unrelated lineages

Kind
What the field holds. The settled view of a field, as a review, a consensus statement or a reference work gives it. Not one study.
Review
Source checked. The cited passage was read, and it says this.

  • Supports

    Convergence, adaptation, and constraintintroduction; section on genotypes and phenotypes

    Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Texts · Review of the field

    The source reads: is a common, perhaps ubiquitous ... ichthyosaurs and dolphins to evolve a streamlined body form ... wings of birds and bats ... Cetaceans and bats have independently acquired 14 identical amino acid changes in Prestin ... adaptations involved in the evolution of echolocating capability in the two groups ... eyes of mollusks, vertebrates, and invertebrates

What this does not establish

"Perhaps ubiquitous" is Conway Morris’s position as Losos reports it; the review does not measure how common convergence is.

Later work looked for

Europe PMC, 2011 on, convergent evolution review: nothing that changes the description of convergence as common.

Corrected

24 September 2026. Previously: “Convergence is everywhere: eyes, wings, echolocation and body plans” The cited review says "common, perhaps ubiquitous", not everywhere, and gives streamlined body form as its example rather than body plans.

Claim 46 · checked 24 September 2026 · AI-assisted audit

Claim: which argues that selection finds the same solutions given the same problems.

Kind
What scholars argue. A report of what specialists argue, or where they disagree.
Review
Source checked. The cited passage was read, and it says this.

The argument is chiefly Simon Conway Morris’s, against Gould.

  • Supports

    Historical contingency and the evolution of a key innovation in an experimental population of Escherichia coliintroduction, paragraph 2

    Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Texts · Review of the field

    The source reads: He and others point to numerous examples of convergent evolution as evidence that selection finds the same adaptations despite the vagaries of history.

  • Supports

    Convergence, adaptation, and constraintintroduction

    Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Texts · Review of the field

    The source reads: Many see in convergent evolution the unfettered ability of natural selection to produce optimal solutions to problems repeatedly posed by the environment.

Claim 47 · checked 24 September 2026 · AI-assisted audit

Claim: The argument survives examination and does not survive it unqualified.

Kind
This page’s reading. A judgement the page makes from the evidence. Others read it differently.
Review
A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.

The page’s summary of the review reported in the next sentence.

Claim 48 · checked 24 September 2026 · AI-assisted audit

Claim: Convergence in similar environments often is selection at work, it can also happen for other reasons, and species under the same pressure sometimes answer it with adaptations that are not convergent at all.

Kind
What scholars argue. A report of what specialists argue, or where they disagree.
Review
Source checked. The cited passage was read, and it says this.

  • Supports

    Convergence, adaptation, and constraintabstract

    Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Texts · Review of the field

    The source reads: I reaffirm that convergence in taxa occupying similar selective environments often is the result of natural selection. However, convergent evolution of a trait in a particular environment can occur for reasons other than selection on that trait in that environment

  • Supports

    Convergence, adaptation, and constraintabstract

    Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Texts · Review of the field

    The source reads: species can respond to similar selective pressures by evolving non-convergent adaptations

Claim 49 · checked 24 September 2026 · AI-assisted audit

Claim: Both observations are correct, which means the question is quantitative rather than binary.

Kind
This page’s reading. A judgement the page makes from the evidence. Others read it differently.
Review
A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.

Follows from the parallel changes and the citrate result reported above, and from the review’s account of convergence.

  • Context

    Convergence, adaptation, and constraintsection on genotypes and phenotypes, closing

    Cited · Link answered, 19 October 2026 · Read in full, 24 September 2026 · Texts · Review of the field

    The source reads: parsing the relative roles of natural selection and constraint in determining the extent and form of biological diversity can be context-dependent and at times subjective

Claim 50 · checked 24 September 2026 · AI-assisted audit

Claim: How much of what exists is inevitable and how much is an accident nobody can currently say, because the experiment that would tell us is the history of the planet.

Kind
Open question. Something the page says is not known.
Review
Presented as open. The page says this is unresolved, and the review found that it is.

Claim 51 · checked 24 September 2026 · AI-assisted audit

Whether prediction is useful in practice

Claim: Whether prediction is useful in practice

Kind
Framing. Signposting. It asserts nothing a source could check.

Claim: Short-term evolution is forecast in practice.

Kind
Observation. Something measured or seen, as the named source reports it.
Review
Source checked. The cited passage was read, and it says this.

What this does not establish

The example is seasonal influenza; the page does not claim this for other organisms.

Later work looked for

Europe PMC, 2015 on, influenza forecasting and fitness models: Huddleston and colleagues (2020) describe current use and improved forecasts; added and the page updated.

Corrected

24 September 2026. Previously: “Short-term evolution is predicted operationally.” The Łuksza and Lässig paper proposes a method; that such forecasts are used in vaccine strain selection is carried by Huddleston and colleagues (2020), now cited.

Claim 53 · checked 24 September 2026 · AI-assisted audit

Claim: A fitness model for the influenza surface protein, inferred from the sequences of strains already circulating, predicts how common each strain’s descendants will be the following year,

Kind
What a model says. What a theory or model predicts or describes, which is not the same as what has been observed.
Review
Partly checked. Only part of the source could be read. What was not read is listed.

  • Supports

    A predictive fitness model for influenzaabstract

    Cited · Link answered, 19 October 2026 · Abstract only, 24 September 2026 · Research in microbes · Model

    The source reads: We infer both fitness components for the strains circulating in a given year, using population-genetic data of all previous strains. From fitness and frequency of each strain, we predict the frequency of its descendent strains in the following year.

What this does not establish

Only the abstract was read, so how accurate the predictions were is not reported here. One subtype, A/H3N2, one year ahead.

Corrected

24 September 2026. Previously: “predicts which of them will dominate the following year” The model predicts the frequency of each strain’s descendants, which is what the abstract says, not which strain will dominate.

Claim 54 · checked 24 September 2026 · AI-assisted audit

Claim: and was published as a principled basis for choosing what goes into the vaccine.

Kind
Historical claim. A statement about the past that historical evidence can test.
Review
Partly checked. Only part of the source could be read. What was not read is listed.

  • Supports

    A predictive fitness model for influenzaabstract

    Cited · Link answered, 19 October 2026 · Abstract only, 24 September 2026 · Research in microbes · Model

    The source reads: This fitness model maps the adaptive history of influenza A and suggests a principled method for vaccine selection.

What this does not establish

Only the abstract was read.

Claim 55 · checked 24 September 2026 · AI-assisted audit

Claim: Experts now choose vaccine strains using forecasts of this kind alongside laboratory measurements,

Kind
Observation. Something measured or seen, as the named source reports it.
Review
Source checked. The cited passage was read, and it says this.

What this does not establish

The paper describes strain selection by the WHO network for influenza A/H3N2; how much weight the forecasts carry in each decision is not reported.

Later work looked for

Europe PMC, 2015 on, influenza forecasting: Huddleston and colleagues (2020); added.

Corrected

24 September 2026. Previously: “” Added from newer work: the page described a 2014 method without saying how it is used or whether it has been bettered.

Claim 56 · checked 24 September 2026 · AI-assisted audit

Claim: and forecasts that add those measurements of how the virus escapes antibodies do better than sequences alone.

Kind
What a model says. What a theory or model predicts or describes, which is not the same as what has been observed.
Review
Source checked. The cited passage was read, and it says this.

What this does not establish

Measured by forecasting past seasons of one subtype, A/H3N2. The authors call the gain over a model that predicts no change low, under one amino acid per year.

Claim 57 · checked 24 September 2026 · AI-assisted audit

Claim: Those predictions are statistical and they are about the next step.

Kind
This page’s reading. A judgement the page makes from the evidence. Others read it differently.
Review
A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.

Follows from the one-year horizon both papers describe.

Claim 58 · checked 24 September 2026 · AI-assisted audit

Claim: They do not extend to what a lineage will look like in a million years, and nothing suggests they could.

Kind
This page’s reading. A judgement the page makes from the evidence. Others read it differently.
Review
A judgement, not a fact. Reviewed for whether it is fairly put and follows from the checked claims. No source can confirm it.

The page’s judgement. Neither forecasting paper claims more than a year ahead.

Claim 59 · checked 24 September 2026 · AI-assisted audit

What was read