Dark skin is found in populations near the equator. Why?
A) It protects from frostbite.
B) It protects from overexposure to ultraviolet radiation.
C) It helps prevent rickets.
D) It protects from the damaging effects of UV radiation on folate.
E) It increases the skin's exposure to ultraviolet radiation.

Question

Quizplus · Accepted Answer

Dark skin contains more melanin which protects folate from being damaged by ultraviolet radiation. Folate is important for maintaining healthy pregnancies, and a lack of folate due to UV radiation damage can lead to birth defects. This provides an evolutionary advantage in populations living near the equator where the intensity of UV radiation is higher.

Dark Skin Is Found in Populations near the Equator