What is the relationship between skin tone, the environment, and healthy babies?

everything you need is in the provided document please just answer directly on it but i will need
these questions answered as well but on a different page:
1) Why are does Homo sapien express so many different skin tones?
2) What is the relationship between skin tone, the environment, and healthy babies?
3) Using your understanding of evolution and natural selection, explain why skin tones likely did not evolve as a defense mechanism against cancer

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