thorium1010 said:
Humans and apes (chimpanzees and gorillas ) shared a common ancestor and diverged about 5 million years ago.
That's only partly true, thorium1010.
Every single living thing on Earth originates from the same essential primordial ooze. But at some point in time some combination of genetic blending resulted in a being which we now call "human." Our classification system starting with Kingdoms, Phylums, Classes, Orders and so forth does not take into account or attempt to calculate at what point a species or multiple species on Earth acquired the ability to "reason."
What we do know is that the dolphin did not. The ape did not. The orangutan did not.
We do not know whether it occurred prior to the 5 million year ago "common ancestor" theory or more recently.
And we also don't know what "common ancestor" even means... we have multiple different "species" of humans in the last 1 million years, each of which likely had the ability to speak as recently as 400,000 years ago (which is probably how the neanderthals and homo sapiens agreed to have sex and make babies, since we know they merged rather than one dying out)!
So really, we have no idea what it means that the apes and the humans "diverged" from one common ancestor. How do we even know it was "one" common ancestor? Maybe there were DOZENS which had so close genetic similarity and ability to communicate that they all mingled together. Nobody knows.
That the apes have similarities to humans could be the result of early "humans," having primitive forms of language and communication, could have taken apes for partners and "cross-polinated" -- resulting in a far more similar range of mammals.
nevertheless the idea that humans diverged from a "common ancestor" is, again, theory at most. We do not know what that means. How many genetic groups does it take to create one common ancestor?