The darker skin of peoples who lived closer to the equator was important in preventing folate deficiency. ... In the summer they get high levels of UV rays reflected from the surface of snow and ice, and their dark skin protects them from this reflected light.
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Answer:
The darker skin of peoples who lived closer to the equator was important in preventing folate deficiency. ... In the summer they get high levels of UV rays reflected from the surface of snow and ice, and their dark skin protects them from this reflected light.