@shortstories Modern humans = arose in Eurosiberian wilds
They mated with:
* Denisovans (Asia)
* Australopithecus or similar (Dravidians, Indonesia, Australia)
* Ergaster or Erectus (Africa)
Africans are part modern humans
Different groups from the human tree can breed, e.g. Neanderthalis
"Human tree" is vague since we know that there are lots of prior species that were not direct ancestors of modern humans. The point is that (1) related species can breed and (2) modern humans are a component of all races.