How different were these species compared to us?
There are differnt theories about that but my personal view is that most of that DNA didn't enter our bloodstream voluntarily. As only female hybrids bear children and those hybrids generally come from female Neanderthals or Humans it is more likely that it was a very involuntary situation in which multiple generation (because it doesn't disapear in the 2nd generation) of females had to have had to bare children.
I know this is 4ct and I can just outright say it, but hey man, it's my job.
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