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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
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There are 60,000 miles of blood vessels in every adult human.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.