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Probably just like the Neanderthals, we humans killed them off, except for the few young females we “adopted”.

Superior organizational skills by humans allowed us to mass greater numbers of, and better supplied warriors.

And we are encoded genetically to fear and dislike those not like us. That encoding persists today.

I agree. Modern humans developed a “leadership gene” which even today appears in a small, but predictable, percentage of the population. A smaller number with that gene have the ability to be leaders of leaders, and so on. This allowed our ancestors to organize tribes much, much larger than simple family units. This not only strgnthened out gene pool, but combined with out innate capacity for genocide, allowed us to crush other and even more physically robust hominids.

Actually, Neanderthals and Sapiens intermixed, as did Sapiens and Denisovans. The reality is that all modern humans are hybrids and contain admixture with at least 2 different members of Genus Homo. All Eurasians have Neanderthal-Sapien admixture, this would include Europeans, Asians and peoples in West-Asia (middle east) and into North Africa. Asians have admixture with not only Sapien-Neanderthal, but also Denisovan. Now if this 100,000 year old Denisovan was a fossil based in the Levant, this would suggest that people there also have Denisovan admixture. Every DNA study I have read till this point indicates only Asians have Denisovan

Peoples of sub-saharan Africa do not have Neanderthal or Denisovan admixture, but do have admixture from some other members of Genus homo. THus they to are hybrids, with Sapien and maybe Homo Rhodesiensis admixture.

So before DNA sequencing, the thought was that the Sapiens killed off the Neanderthals, etc. Now we know that was not the case, they just got absorbed, as did the Denisovans. Modern humans contain admixture, all of us are Homo Sapiens with admixture with other genus homo members, it is just some have admixture with Neanderthals, some don’t some have admixture with Neanderthals and Denisovans, some don’t etc. Some have admixture with a non H. Sapien African species (peoples south of the sahara) some don’t.