why do body cells require oxygen

 Cells require oxygen to provide energy in the body for growth and develpoment ......as we know that aerobic respiration requires food(glucose)+oxygen which gives out energy+Co2....

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i need the answer

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for break down of food

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oh silly ! for burning food to fulfill the need of energy.

what have you read in all the lesson?

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dam foo! look at your face after reading this in the mirror!

HA! HA! HA!

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