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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The average adult has about 21 square feet of skin.
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Medication errors are three times higher among children and infants than with adults.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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The familiar sounds of your heart are made by the heart's valves as they open and close.