1.

Which of the following correctly represents the approximate composition of exhaled air by humans?

A. \[{{O}_{2}}\]=21%\[C{{O}_{2}}\]=4.4% 
B. \[{{O}_{2}}\]=21%\[C{{O}_{2}}\]=0.03%
C. \[{{O}_{2}}\]=16.4%\[C{{O}_{2}}\]=4.4%
D. \[{{O}_{2}}\]=16.4%\[C{{O}_{2}}\]=0.03% 
Answer» D. \[{{O}_{2}}\]=16.4%\[C{{O}_{2}}\]=0.03% 


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