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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.