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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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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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There are 20 feet of blood vessels in each square inch of human skin.