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Evolution of eye color and hair color

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Okay I understand that the sun might be responsible for the evolution of human skin color, but how do you explain the change from brown to green to blue eyes? And how about black, brown and blonde hair? Not to mention frizzy to straight hair? How did this change? The sun has nothing to do with eye color, hair color, except that a lot of sun can make hair lighter but that actually contradicts the statement, and hair texture? Please give suggestions. Thank You.