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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Illness; diuretics; laxative abuse; hot weather; exercise; sweating; caffeine; alcoholic beverages; starvation diets; inadequate carbohydrate consumption; and diets high in protein, salt, or fiber can cause people to become dehydrated.
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There are more sensory neurons in the tongue than in any other part of the body.
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Cyanide works by making the human body unable to use oxygen.
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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.