What percentage of oxygen is contained in exhaled air? by Sunday | Apr 29 | Biology NECO | 0 comments A. 21% B. 16% C. 4% D. 0.04% E. Less than 0.01% Correct Answer: Option B – 16% Users Also Read These:Exchange of gases takes place in the air sacs…A source of sound produces waves in air of…If 0.75 mole of cyclopropane and 0.66 mole of oxygen…The partial pressure of oxygen in a sample of air is…The system of election whereby each political party…