Which Statement BEST Describes Why a Higher Concentration of Carbon

Which statement BEST describes why a higher concentration of carbon dioxide is present in exhaled breath compared to inhaled breath?

A) Actually, a higher concentration of carbon dioxide is present in inhaled breath.
B) Once the oxygen is used up in an inhalation, a larger percentage is carbon dioxide.
C) The oxygen in inhaled air reacts in the lungs to make carbon dioxide.
D) The concentration of carbon dioxide in the tissue is lower than that in exhaled air.
E) Carbon dioxide is produced during cellular respiration and then carried by the blood to the lungs to be exhaled.

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