The percentage of oxygen in the air is 21.0%, but the percentage in air exhaled while breathing is __________.
A. 21.0%
B. 18.0%
C. 16.0%
D. 14.0%
E. none of the above
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Answer:
the answer to your question is option E.
Explanation:
Because the percentage in air exhaled while breathing is 4.4 %
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