While early humans’ migration led to changes in our skin tones, what affected the distinctive face characteristics of each race?
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The environment might cause a few certain features. Disparate peoples in with little to no contact for many years can often have similar features because of where they live. Big lungs and small bodies for people at altitude, for example.
It’s perfectly reasonable to say most of it is down to chance. Often very small groups of humans made it to a new place and they were on their own. Any genetic features they already had could be reinforced for no evolutionary reason. It’s just down to having a small starting population.
Places like India and China have different looks, despite being very close to each other. This must be down to borders and cultural reasons since the environment isn’t that different. Yes of course the become a bit more similar at the borders, but that’s just because they’re bound to meet.
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