which gas shows the greatest difference in percent between inhaled and exhaled air?

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  1. My suggestion would be CO2
    The air we breathe in contains about 0.04% carbon dioxide.
    The air we breathe out contains about 4% carbon dioxide.
    In other words, exhaled air contains about 100 times the concentration of carbon dioxide that inhaled air does.
    There is a corresponding but small change in the O2 content.

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