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Q.

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


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a

Nitrogen

b

Oxygen

c

Carbon dioxide

d

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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