Which one of the following gas in the atmosphere is essential for respiration?

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Nitrogen

Oxygen

Carbon dioxide

Hydrogen

answer is B.

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Detailed Solution

Oxygen is essential for respiration.
Air combines many gases like nitrogen, oxygen, carbon dioxide, argon, etc. Almost all living things need air to breathe. Respiration is a chemical process by which living organisms inhale oxygen and release carbon dioxide. The inhaled oxygen is then used to provide energy. Oxygen will combine with protons to form a water molecule.

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