Respiration is the chemical reaction in which energy is released from a reaction between Oxygen and Glucose. Respiration releases energy for cells from glucose. Combustion is essentially burning, fuels react with oxygen to releases energy.
The difference between them is that Respiration is the process where oxygen is taken in and carbon dioxide is exhaled out and combustion means the burning of substances in the presence of oxygen.
Any substance which can burn leads to combustion while respiration uses glucose to give pyruvate and to carbon dioxide. Combustion produces oxides in the form of smoke in respiration, there is no smoke formation. The product of combustion is heat energy in respiration, it is the formation of ATP.
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