How are the definitions of homologous structure and vestigial structure similar and how do they differ?
A vestigial structure is a homologous structure, i.e., a structure that is in common between two organisms by descent; a vestigial structure, however, has at best a marginal function in the possessing organism whereas homologous structures are simply similar due to common ancestry (i.e., a vestigial structure is no-longer used structure that is similar by descent to a functional structure found in another organism) (Chapter 22)
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