African Americans have darker skin than other Americans. Researchers were not surprised to discover therefore, that vitamin D insufficiency among African Americans is _____ than among other Americans?
more prevalent less prevalent
A B
Pigments in the skin act like a filter that can prevent the skin from making vitamin D. As a result, people with darker skin need more time in the sun than people with lighter skin to make the same amount of vitamin D.
vitamin D
darker
prevent
MORE
LESS
darker skin
less prevalent
more prevalent
vitamin D insufficiency
vitamin D insufficiency
vitamin D insufficiency