Why do different ethnicities/races look different?

I realised that for some reason, I still don’t know this. Why do we have different skin colors, hair textures, eyes or such? Is it just a random thing that happened or are there evolutionary reasons to it?

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originalucifer@moist.catsweat.com
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20 天前
the simple reason is geographic isolation of populations. over time groups of people in different places gain minute genetic differences relating to their region/breeding population.

its geography + genetic drift

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