1. In humans, darker skin color is adaptive at latitudesnear the equator (where ultraviolet light is most intense) becauseUV light
stimulates synthesis of folic acid ï¯
causes breakdown of folic acid ï¯
stimulates synthesis of vitamin D ï¯
causes breakdown of vitamin D
2. In humans, lighter skin color is adaptive atlatitudes far from the equator because UV light
stimulates synthesis of folic acid ï¯
causes breakdown of folic acid ï¯
stimulates synthesis of vitamin D ï¯
causes breakdown of vitamin D
