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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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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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By definition, when a medication is administered intravenously, its bioavailability is 100%.
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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.