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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The horizontal fraction bar was introduced by the Arabs.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.