What is the Evolutionary Origin of Light Skin in Humans

Question

What is the evolutionary origin of light skin in humans?
A) Light skin evolved several times in response to high ultraviolet light levels.
B) Light skin evolved several times in response to low ultraviolet light levels.
C) Light skin evolved several times in areas where there was no malaria.
D) Light skin evolved as an adaptation that decreased folate levels in humans.

Accepted Answer

Light skin evolved multiple times in human history as an adaptation to environments with low ultraviolet (UV) light levels. In regions farther from the equator with less intense sunlight, lighter skin increases the synthesis of vitamin D, which is crucial for bone health and other physiological processes. This adaptation helps compensate for lower UV levels, which are necessary for the skin to produce vitamin D.