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Author Question: In ____________________ irrigation, water is released onto fields from open canals. Fill in the ... (Read 32 times) |
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.