Multiple choice

What happened to people's skin when they moved to colder climates with less sun?

  1. A beautiful tan

  2. Stayed the same color

  3. Skin became lighter

  4. Skin became darker
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As human populations migrated to northern regions with less intense sunlight, natural selection favored lighter skin. Lighter skin allows the body to absorb more ultraviolet radiation, which is necessary to synthesize vitamin D in environments with low sunlight.

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