Up till a few hundred years ago, people regularly ate undercooked and raw meat as part of their diet. In the 1800's (when appendicitis was first diagnosed by Reggie Fitz in 1886.) appendicitis was becoming almost epidemic because we cooked our meats thoroughly and the appendix was becoming obsolete. With no raw meats to help digest, they just got "sick" and needed removal. In a few more generations people will be born with no appendix at all. It helped fight bacteria associated with raw meats. That, creationists, is called observable evolution.