Multiple choice

Which of the following human traits is a result of natural selection?

  1. Hitchhiker's thumb

  2. Skin colour

  3. Widow's peak

  4. Tounge rolling

  5. Eye colour
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Human skin colour ranges in variety from the darkest brown to the lightest pinkish-white hues. Human skin pigmentation is the result of natural selection. Skin pigmentation in human beings evolves primarily to regulate the amount of ultraviolet radiation penetrating the skin, controlling its biochemical effects.

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