define respiration. why is it called a
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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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Respiration is the taking in of oxygen for breaking down of food to provide energy for cellular needs and for other life procceses going on in the body .there are 2 types of respiration namely--aerobic and anaerobic respiration
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