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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.