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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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In 1864, the first barbiturate (barbituric acid) was synthesized.