Well, we can’t really know for certain, as that goes far beyond recorded history, but humans have always adapted well. We can see from the varying body types what would have worked better for humans when. In hot areas, people have long limbs and dark to skin to survive better, with lots of curly hair to keep the sun from cooking their brains. In cool areas, people are more compact, so they conserve more body heat. I’d imagine these changes were also wrought on humanity as a whole through the ages.
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