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Author Question: An excretory system that is partly based on the filtration of fluid under high h (Read 593 times) |
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.