The expelled air has higher percentage of which of the following gases?

Carbon dioxide

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Oxygen

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Hydrogen

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Water

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Solution

The correct option is A Carbon dioxide
The animals respire by taking in the oxygen. The mitochondrial respiration results in the release of carbon dioxide through the respiratory system. The glucose is broken down to release carbon dioxide. The gases which are expelled out constitutes majorly carbon dioxide which is the waste product of the respiration reactions.
Thus, the correct answer is option A.

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