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WHAT IS RESPIRATION
Respiration can refer to many different cellular and physiological processes that occur in living things and are related to the generation of energy. One example of such a process is breathing, by which oxygen is taken into the body and carbon dioxide is removed. A similar process also occurs in aquatic creatures as they extract dissolved oxygen from the water using their gills or similar organs. Oxygen is necessary for the process of cellular respiration, by which cells produce useful energy. Another common example occurs in the roots of plants as the plants exchange various gases with the atmosphere.


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