Expiration is the process of

Taking air in

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Inhalation

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Releasing CO

_{2}

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Giving air out

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Solution

The correct option is D Giving air out
During expiration, the diaphragm relaxes, and the volume of the thoracic cavity decreases, while the pressure within it increases. As a result, the lungs contract and air is forced out.
Therefore, the correct answer is option D.

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