While conjectures may be made, as far as I understand, humans and chimpanzees, gorillas, monkeys and the like in the so-called ape category are said to have an Unknown Common Ancestor. I hope hope hope you will not tell me the common ancestor is known. puleeze, I'm almost begging you not to tell me that. But if you do it's known for an absolute (and I mean absolute without wavering forever) certainty -- ok, sorry but the offering of the opinion down a few more notches of credibility in my opinion.