Answers

2014-05-25T18:28:52+05:30
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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2014-05-25T19:26:54+05:30
Exhaled air contains more co2.
alveoli in human beings helps to maximize the exchange of gases
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