Biology / Bio 1661 · Atom · ~20 seconds
Vestigial Structures
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A vestigial structure is a homologous structure that persists despite serving little or no function today, a remnant of an ancestral form.
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Hind leg bones in whales and wings on flightless birds are vestigial, inherited from ancestors that used them functionally.
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A vestigial structure's reduced function does not mean it is not homologous to a functional structure elsewhere.