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Respiration is the process of oxidation or breaking down of organic compounds, particularly glucose with the release of energy.It is a biochemical process in which chemical energy of organic molecules is converted into usable energy in the cells.

Oxidation of food
It can be defined as the process by which cells utilize O²,produce CO² and convert energy into useful forms for the growth and repair of cells.

Respiration will break down the energy from food and it also involved breathing also
The process of realising energy from food