Evolution is not a theory; Natural Selection is a theory to explain evolution. Evolution is observable in nature. Evolution is an accepted scientific fact. There are no valid modern biologists who do not accept evolution as a fact. Wiley InterScience :: Session Cookies The Short Proof of Evolution Human Genome Shows Proof of Recent Evolution, Survey Finds Proof for Evolution? Evolution is a Fact and a Theory In an effort explain how evolution happens, Darwin put forth several theories which all kinda work together: Natural Selection, Sexual Selection, etc. So, does everyone understand now? Any questions?