The air we breathe out contains more _________.

Carbon monoxide

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Carbon dioxide

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Water vapour

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Methane

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Solution

The correct option is B Carbon dioxide
The air we inhale is a mixture of gases that includes mainly oxygen, nitrogen, and small amounts of carbon dioxide, etc. The respiratory tract carries air from the nose to the lungs. Oxygen is diffused into blood and carbon dioxide from blood diffuses into the lungs. Oxygen is used by body cells for producing energy. Thus, we exhale the air in which the percentage of carbon dioxide is more than its percentage inhaled. The amount of nitrogen inhaled is the same as the amount of nitrogen exhaled.
So, the correct option is B.

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