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respiration - in broader sense it means the breakdown of nutritional materials in cells to provide energy while  in human respiration means the use of atmospheric oxygen at cellular level to oxidize glucose molecules and release energy in the form of ATP is respiration in other hand breathing means as on exchange of gases like higher plants have stomata for breathing while in human respiratory system consists of breathing apparatus which is in direct contact with the environment providing the passage of air and site for exchange of gases .
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breathing means in haling and exhaling
but respiration means releaing energy by breakdown of food molecules
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