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Question
Which of the following is a characteristic of vitamin D nutrition?
a.Vitamin D deficiency may be created by a calcium deficiency
b.Only about one-half of the world's population relies on sunlight to maintain adequate vitamin D nutrition
c.Prolonged exposure to sunlight degrades the vitamin D precursor in skin, thus preventing vitamin D toxicity
d.In people living in northern U.S. cities, vitamin D stores from synthesis during the summer are usually sufficient to meet the needs during the winter
e.Pigments in dark skins increase vitamin D synthesis.
Answer
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