Comparative Embryology as Evidence
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Comparative embryology finds structures shared across related lineages' embryos that vanish before adulthood, evidence those lineages share a common ancestor.
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All vertebrate embryos, including humans, briefly develop gill slits and a tail, persisting to adulthood only in some aquatic lineages.
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A structure that disappears before adulthood still evidences common ancestry — its absence in the adult does not erase that history.