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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
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There are approximately 3 million unintended pregnancies in the United States each year.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.