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Author Question: Which statement about the nitrogen cycle is true? (Read 810 times) |
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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.