Explain the metabolic rate of aerobic organisms, Biology

Why can the consumption of molecular oxygen indicate the metabolic rate of aerobic organisms?

Molecular oxygen (O2) consumption has direct relation to the cell metabolic rate in aerobic cells and so to the metabolic rate of the organisms. Cells having higher metabolic activity demand more energy and such energy comes from ATP molecules. As there is require for ATP production, the intensity of aerobic cell respiration is also higher and then more oxygen is consumed.

 

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