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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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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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