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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 worlds 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
Answer
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