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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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The average adult has about 21 square feet of skin.