Which gas in air is essential for respiration?

Oxygen

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Nitrogen

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Nitric oxide

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Carbon monoxide

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Solution

The correct option is A
Oxygen

Oxygen is essential for respiration in all the living organisms. We breathe in oxygen and some of carbon dioxide. When we exhale, we breathe out less oxygen but more carbon dioxide than we inhale. Oxygen plays a vital role in the metabolism of the living organisms. The only living cells that do not need oxygen are some anaerobic bacteria that obtain energy from other metabolic processes.

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