What is the pourpose of an appendix?

Answer 1

It is considered as a vestigial structure.Its function was to house cellulose digesting bacteria in ancient human.But along with the evolution,appendix has lost bacteria in it. Appendix serves as a safe house for useful bacteria when a disease flushes the intestine

Answer 2

the appendix purpose is to "reboot" the intestines after a bad illness.

Answer 3

It appears that the appendix has has an involvement in the immune system. Without the appendix people often don't have a fully operational immune system.