I agree, Euphoric, but then we can trace most species back to their original (post-apoclyptic time) ancenstors.

We cannot do that for us, because of the 'missing link' - therefore, in respect of us, the theory can't be proved irrevocably.

Mind you, go down yer local town center on a saturday night, and you may see certain examples of human life that could quite easily be candidates for the missing link lol