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a process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide from the oxidation of complex organic substances.
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It is the breathing system of a living organism in which intake air and release carbon dioxide. Hope I helped u.. Plz mark as the BRAINLIEST answer..
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The process of taking in air rich in oxygen and giving out air rich  in carbondioxide
The action or process of inhaling and exhaling; breathing. Also called ventilation.
b. An act of inhaling and exhaling; a breath.
2. The action or process by which an organism without lungs, such as a fish or plant, exchanges gases with its environment.
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