In humans the Appendix is a vestigial organ. Does it serve no apparent purpose in all the vertebrates that have one?
Consider a biological structure which no longer benefits an organism, such as the eyes of an organism whose population now lives in total darkness. I can think of three reasons why such a structure ...
Is it a myth that modern whales have been found with hind legs sticking out of their sides and full formed tibias, fibias, and toe bones? I keep finding assertions, but no citations. For example, the ...
What is the biological function of nose hair? In general, can we consider underarm hair and pubic hair to be vestigial structures?