What best describes a vestigial structure

Vestigiality is the retention during the process of evolution of genetically determined structures or attributes that have lost some or all of their ancestral function in a given species. Assessment of the vestigiality must generally rely on comparison with homologous features in related species

Explanation:

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these are structures which have reduced size to an extent they have ceased to function

Explanation:e.g appendix in man also coccyx

answer; i believe the answer is (polygenic inheritance;