Question

The percentage of carbon dioxide in the air is 0.03%, but the percentage in air exhaled while breathing is __________.

A. 0.03%
B. 0.30%
C. 0.40%
D. 4.00%
E. none of the above

Answer 1

Answer:

When we inhale, we take in air that contains about 21% oxygen and 0.03% carbon dioxide (the rest of the air is mostly nitrogen). When we exhale, we expel air that contains about 5% carbon dioxide and only 15% !

Answer 2

Explanation:

4% to 5% is right one.

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