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An Aborigine is still homo sapians sapains. The are still far, far above chimpanzees.

Regarding the difficulty of interbreeding with Aborignes, I do not know anything about that. Only I assume that the size of the test sample could not be that large. Just how many civilized people are there that even want to breed with Aborignes?

You and your compadre are looking for bright lines where you will find none. The evolutionary model does not depend on brightline transitions and so it is not challenged by your failure to find these regardless of the fact that you have set this as your impossible standard. Sorry.

As for the Aborigines, the rate of miscarriages and stillbirths that follow mixed conceptions are quite high - certainly higher than those of nonmixed conceptions or of mixed conceptions between any of the other races. Were it not such a politically charged argument, then it would be accurate to call Aborigines a subspecies of Homo Sapiens.