Humans have a lot of homologous structures in common with other animals, and several of these structures are no longer in working order in human bodies. These nonfunctioning structures are called vestigial structures. They still show evidence of common ancestry, but they do not do the same things in humans as they do in other animals. Listed below are mostly vestigial structures. Select the one that serves a purpose in humans.
The appendix is the vestigial structure that serves a purpose in humans. It may have a role in the immune system, but its exact function is still not completely understood.
