What are the advantages of light skin, and why is it selected for at higher latitudes?

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What are the advantages of light skin, and why is it selected for at higher latitudes?

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Light skin is an adaptation to the relative lack of direct sunlight far from the equator. The sun provides us with heat as well as enables us to produce Vitamin D, and probably other things too. Light skin absorbs more of this good stuff than dark skin does from indirect sunlight, but the cost that comes with is increased risk of skin cancer.

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