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The horizontal fraction bar was introduced by the Arabs.
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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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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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Illicit drug use costs the United States approximately $181 billion every year.
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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.
![Allen Test: A patent ulnar artery reveals the return of palm perfusion despite radial artery compres](https://biology-forums.com/gallery/47/medium_2137_21_07_12_6_35_44.jpeg)
![Lymphatic vessels pick up excess tissue fluid, purify it in the lymph nodes, and then return it to t](https://biology-forums.com/gallery/47/medium_14755_01_10_12_7_59_21_92301561.jpeg)