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Which contains more co2: exhaled air or inhaled air? why

how are lungs desinged in human beings to maximize the exchange of gasses


Exhaled air has more co2 than inhaled air.lungs have small small alevielos in lungs to maximze exchange of gases.            alevielos spelling is i thing so is wrong
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Exhaled air contains more co2.
alveoli in human beings helps to maximize the exchange of gases
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