Which of the following substances are expelled during expiration?

Water vapor

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Carbon dioxide

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Small amounts of oxygen

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All of the above

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Solution

The correct option is C All of the above
Expiration is the removal of carbon dioxide from the alveoli of lungs but the air also contains water vapour and a little amount of water as the air is dry and pick some moisture from lungs and condense it while exhaling.
So the correct option is 'All of the above'.

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