Why do different ethnicities/races look different?
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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Some features, such as melanin levels, are due to evolutionary pressures. High levels of melanin protect you from the sun, lower levels of melanin boost your vitamin D production.
Other features are just random. Over time, human populations were affected by random changes that weren't exactly useful but not detremental either. They're called sprandels. According to a quick Google search, blue eyes don't seem to have any advantages, but not really any major disadvantages either, so that would be an example of that.