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In the above table why is there no change in nitrogen percentage ?

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Observe the table and answer the following.

Gas % in inhaled air % in exhaled air
Oxygen 21.00 16
CO2 0.03 4
Nitrogen 78 78

In the above table why is there no change in nitrogen percentage ?

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Nitrogen has no role in our respiration. So there is no change in the percentage of nitrogen.

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