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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The average adult has about 21 square feet of skin.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.