interbreeding

I think I've heard there's evidence that interbreeding happened in Europe as well.

If you have any interbreeding at all the general conclusion holds.

First, people have been interbreeding like rabbits throughout history; there are no "pure" stocks anywhere.

After all, you still wouldn't have people going from planet to planet often enough for there to be much interbreeding.

Culture has nothing to do with it, even neanderthals were interbreeding with early modern humans.

I would guess that even extremly low estimates of interbreeding rates wouldn't change the result much.

They are declared species due to their appearance, and their natural range's prevention of interbreeding.

Yes with them our cousins there is the possibility of interbreeding having occurred, but most likely is that as a species as a whole they went extinct from competition.

Eventually this interbreeding may reduce the clustering to mere random clustering, but today there are still strong, clear clusters of genetic affinity.

The key differences between natural systems and computer systems is that vulnerabilities don't kill a piece of software, and there's no interbreeding.

Someone alive today would have to become a common ancestor of every Lapp in Finland, every Aborigine in Australia, every Inuit in Nunavut, every Maori of Polynesia, every Falklander, every North Korean, and countless more groups that barely have any contact with the world community, let alone interbreeding.