Biology / Bio 1659 · Atom · ~20 seconds
Homologous Structures
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Homologous structures are anatomically similar features inherited from a shared ancestor, even where present-day size, shape, or function has diverged.
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The same bone arrangement appears in a human arm, a bat wing, and a whale flipper, inherited from one ancestor's forelimb.
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Homology is judged by shared structure and origin — not by whether the structures currently serve the same function.