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Which of the following is a characteristic of vitamin d nutrition? a. pigments in dark skins increase vitamin d synthesis. 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. vitamin d deficiency may be created by a calcium deficiency e. 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
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Which of the following is a characteristic of vitamin d nutrition? a. pigments in dark skins increas...
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