We do.
Check out progesterone and its various--disparate uses--throughout the various species.
No, we don't! Surely you didn't write that with a straight face.Progesterone is not a chemical that is waitng for something to do. If evolution as taught today is correct, we should have millions of currently useless chemicals in our body hanging around just in case evolution needs them. We don't.
It's chemistry, not morphology that is the bugaboo of Darwinism as it is currently taught.