AP BIOLOGY

Detailed explanation-1: -Charles Darwin listed a number of putative human vestigial features, which he termed rudimentary, in The Descent of Man (1871). These included the muscles of the ear; wisdom teeth; the appendix; the tail bone; body hair; and the semilunar fold in the corner of the eye.

Detailed explanation-2: -A vestigial structure is a biological structure that has lost a major ancestral function and is usually drastically reduced in size. Well-known examples include the eyes of blind cave fishes and blind cave salamanders, and the diminutive wings of kiwis and emus.

Detailed explanation-3: -Homologous structures are structures, or body features, that are similar in two different species. The structures are similar because they were inherited from a common ancestor. Scientists can examine homologous structures to determine how closely related two species are to each other on the phylogenetic tree of life.