A) 0.04%
B) 0.03%
C) 4.5%
D) 21%
Correct Answer: C
Solution :
Amount of in expired air is 4.4%. The air we breathe in contain about 0.04%. The air we breathe out contains about 4%. In other words, exhaled air contains about 100 times the concentratioon of that inhaled air does.
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