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Author Question: 18) The concentration of carbon dioxide in the atmosphere is ________. A) a small fraction of 1 ... (Read 62 times) |
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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The horizontal fraction bar was introduced by the Arabs.