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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.