![]() The emergence of vestigiality occurs by normal evolutionary processes, typically by loss of function of a feature that is no longer subject to positive selection pressures when it loses its value in a changing environment. Assessment of the vestigiality must generally rely on comparison with homologous features in related species. ![]() Vestigiality is the retention, during the process of evolution, of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species. In humans, the vermiform appendix is sometimes called a vestigial structure as it has lost much of its ancestral digestive function.
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