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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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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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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.