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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.