>>12564924>>12564933the differnece between species isnt as sharp as people think. Ther can be two populations of the same species, that inhabit neighbouring territories. (parapatric, synpatryc) There will be genetic flow between individuals of the two populations that live nere the border of there respective terrritories. The individuals on the edges might not be able to breed, but they can breed with those of the same population living closer to the border.
What im trying to explain is that speciation is slow, and not so "sharp". it can be reversed. Early stages of speciation could have started, when different human populations isolated (allopatric, peripatric), but is being reversed thanks to travel and interbreeding with the seperated populations.
To be clear these isolations happened wwithin the past 50-60 thousand years, which in humans with our long lifespans is not enough to cause speciation. these are geneticly different mostly only in which alleles are present
