___ is essential for the process of respiration in animals.

Nitrogen

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Oxygen

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Carbon monoxide

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All of these

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Solution

The correct option is B
Oxygen

Oxygen is essential for the process of respiration in animals. In the process of respiration, the animals take in or breathe in oxygen and breathe out carbon dioxide. Oxygen is responsible for the breaking down of molecules present in our body which release energy.

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The animals breathe in carbon dioxide and breathe out oxygen in the process of respiration.

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Oxygen is an essential requirement for aerobic respiration but it enters the respiratory process at the end? Discuss.

Which of the following air pollutant reduces the oxygen-carrying capacity of blood to a large extent?

(a) carbon dioxide

(b) nitrogen monoxide

(d) sulphur dioxide

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