Numerous biological reasons can be pointed to as evolutionary matters in support of various differences, both physical and psychological.
As example, numerous studies (always suspect of course) suggest that women tend to have higher language skills, while men tend to have higher math skills. Evolution prior to modern society would seem to offer reasons for both those conclusions.
"Equality" and "identical" are not the same concepts. But it is easy to mix them up.
Last edited by joko104; 01-26-12 at 04:09 PM.