Biology / Bio 1647 · Atom · ~20 seconds
Three Premises of Natural Selection
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Darwin argued natural selection inevitably follows from three premises: traits are heritable, more offspring are produced than resources can support, and offspring vary.
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Where heritable variation exists and resources limit survival, individuals whose variants best fit the environment leave disproportionately more offspring.
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All three premises must hold together — heritability alone, without limited resources and variation, does not yield natural selection.