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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.
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Your heart beats over 36 million times a year.
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There are more sensory neurons in the tongue than in any other part of the body.