define respiration. why is it called a chemical process?
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Respiration (physiology) In physiology, respiration is the movement of oxygen from the outside environment to the cells within tissues, and the transport of carbon dioxide in the opposite direction.
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Respiration is the process in which organisms exchange gases between their body cells and the environment.it is also called ventilation.
it is a chemical change because it is taking in oxygen and utilizing it to release energy as energy is released so it is a chemical change whereas breathing is a physical change as it is just taking in oxygen
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