AP BIOLOGY

Detailed explanation-1: -Arrector Pili This process is vestigial in humans because we don’t have enough hair or fur to make it worthwhile. Fluffing up hair or fur creates pockets to trap air and warm the body. It also can make the animal look bigger as protection against threatening creatures.

Detailed explanation-2: -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-3: -The coccyx is a triangular arrangement of bone that makes up the very bottom portion of the spine below the sacrum. It represents a vestigial tail, hence the common term tailbone.