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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.