Vestigial organs of course. You never heard of them?What organs?
Another example of a vestigial organ?Vestigial organs of course. You never heard of them?
These are parts of the body that once had a function but are now more-or-less useless. Probably the most famous example is the appendix, though it is now an open question whether the appendix is really vestigial.
Although I also believe the appendix is a vestigal organ though.. Evolution!!