_____ is necessary for breathing.

Oxygen

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Carbon dioxide

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Smoke

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Nitrogen

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Solution

The correct option is A Oxygen

Oxygen is necessary for breathing. When we inhale, we take in oxygen from the air.

When we exhale, we give out carbon dioxide to the atmosphere.

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Similar questions

(i) How does the air necessary for breathing enter the body of a human being

(ii) what other functions are performed by this part of a respiratory system?

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