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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teft
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10•17 days ago
Time to get off the internet, Dr. Jackson. I’m sure those goa’uld will show up in their spaceships any day now.
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  4•17 days ago

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