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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The average adult has about 21 square feet of skin.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").