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...tosynthesis]], the use of [[energy]] from [[sun]]light to convert [[carbon dioxide]] into [[sugar]]s and other organic compounds. In vascular plants, it is t ...to the [[respiration]] of animals, which consume oxygen and exhale carbon dioxide, and makes it possible (with care) to produce an atmospherically closed sys

...0%, they are rounded and actually add to slightly less) composed of carbon dioxide and other trace constituents. A fair amount of water vapor is also suspend