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B
Oxygen and carbon dioxide
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C
Carbon dioxide
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D
None of these
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Solution
The correct option is B Oxygen and carbon dioxide
Inhaled air contains more oxygen used to create energy and less carbon dioxide.
Exhaled air contains more carbon dioxide produced as a waste product of energy production and less oxygen as it has been used in respiration. Gas exchange takes place by diffusion in the alveoli within the lungs.
As a result, the composition of inhaled and exhaled air is different.