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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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There are approximately 3 million unintended pregnancies in the United States each year.