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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.