please do we´re here to learn if anyone finds it boring he can just skip it
to the best of my knowledge dna studies show that the diference beteween a native american and a greek was only of around 24.000 years since they had a common ancestor and most humans in the world are extremly similar except for africans wich are those who are most diferent from the rest and thus can be the human salvation towards a diversification of our gens pool
the explination that was given to me for this was the java super volcano that exploded around 80.000 years ago and created a type of nuclear winter wich in turn killed all major animals in great numbers and thus humans also creating a botleneck effect like the one currently seen in cheetah´s in africa
as for people talking about mutations i don´t consider them bad the base for any species diversity lies in those mutations or else we would all be clones, the major problem i believe (and i´m not certain of this) is that most mutations are the "right" mutations
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