I’m not asking about dark or light. I’m asking why not shades of blue or green?
Bonus question: hypothetically, what factors could lead to other skin colors, like the aliens in avatar?
In: 18
Make it short for ya:
In africa / high sunlight exposure places people needed melanin to not get sunburnt.
When they went further north, there was less sunlight, so they evolved brighter skin to catch more sunlight to get enough vitamin D
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