Evolution, humans – like all living creatures – evolved to be able to live in the environment they’re in. For example, vitamin D, as humans lived further away from the equator, they evolved to have paler skin which helped with synthesizing vitamin D with less exposure to the sun. Now, take those white people and put them in Northern Australia and watch how they get skin cancer so easily.
This is a bit simplified, so, yes I know there are other factors but I’m not going into that.
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