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The atmospheric carbon dioxide concentration has risen from about 270 parts per million (ppm) before 1700 to about 355 ppm today. Climate changes, including a mean global surface temperature rise of between 2.8 and 5.2°C, have been predicted by five independent general circulation models (GCMs) for a doubling of the carbon dioxide concentration. The objectives of this paper are to examine plant responses to rising carbon dioxide levels and climatic changes and to interpret the consequences of these changes on crop water use and water resources for the United States.
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Tobacco effects the body in ways such as, unhealthy teeth, heart problems, premature aging of the skin, blood clots, and in some cases yellowing of fingertips.
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b, the definition of an ion is a charged atom or molecule
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Because butterfly helps in asexual reproduction in plants and nutrition for butterfly
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The Mesozoic Era is the age of the dinosaurs and lasted almost 180 million years from approximately 250 to 65 million years ago. This era includes 3 well known periods called the Triassic, Jurassic, and Cretaceous periods. A mass-extinction<span> marked the beginning and end of the Mesozoic Era.</span>