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| car·bon cy·cle |
noun |
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| Definition: |
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1. carbon flow between organisms and environment: the exchange of carbon between living organisms and the environment. Carbon dioxide is taken from the atmosphere by photosynthesizing plants and returned by the respiration of plants and animals and by the combustion of fossil fuels.
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2. source of energy in stars: a chain reaction believed to generate significant energy in some stars, in which carbon is used as a catalyst to fuse four hydrogen nuclei into one helium nucleus
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