The concentration of which of the following gases remains unchanged in the process of inhale and exhale in the respiratory process?

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N2. The concentration of nitrogen gas remains unchanged in the process of inhale and exhale in the respiratory process. The concentrations of oxygen and carbon dioxide are 21% and 0.03% respectively in inhalation and 16.4% O2 and CO2 4.4% during exhalation.

The concentration of which of the following gases remains unchanged in the process of inhale and exhale in the respiratory process?

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