Polaris
Active Member
No, the graph I linked to clearly shows several instances where human sub-species have coexisted. But eventually one either became extinct like A. garhi or was absorbed with another like A. rudolfenis and A. habilis.
OK, and I can understand how that explains many of the human sub-species, but to suggest that ALL human sub-species fall into those two categories seems like a stretch.
Evidence suggests that Humans have been capable of traveling all over the Earth for thousands of years so wouldn't it be harder to believe that any group could stay isolated long enough to stay distinct?
Being capable of travelling all over the earth and actually doing it to the extent that we dominated the competition across every stretch of habitable terrain is quite a difference.