The process by which oxygen is used to burn down food chemically and release energy in the body is known as:
A
Breathing
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B
Excretion
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C
Circulation
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D
Respiration
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Solution
The correct option is D Respiration Breathing only facilitates the exchange of gases. The whole process of breathing combined with utilising oxygen for the burning down of assimilated food chemically to give energy is known as respiration.