Anthony - evolution is a guess a hypothesis that can not be proven at least at this time. It is not a truth but in school and from it's supports it is taught in most cases with certainty - the way things happened. Obvious to who "But obviously something close to them had existed and did eventually become tetrapods"? Since evolution is only a theory it should be taught as such but it isn't in the books my kids came home with and what was written by their teachers was evolution as far from it being a theory but as if it were provable and anyone that says differently is a idiot which is far from the truth.