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What is respiration ? How does it occur ...

What is respiration ? How does it occur ?

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(i) The process of release of energy by oxidation of food is called as respiration.
(ii) In living organisms, respiration occurs at two levels-body and cellular level.
(iii) In case of body level, oxygen and carbon dioxide are exchanged between the body and surrounding.
(iv) In case of cellular level, food is oxidized either with or without the help of oxygen to release energy.
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