The lack of which of the following constituents of air forces us to gasp and struggle to breathe?

Water vapour

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Carbon dioxide

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Nitrogen

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Oxygen

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Solution

The correct option is D
Oxygen

As a general rule, the faster and deeper you breathe, the greater is the air exchange happening in your lungs. Breathing becomes faster if the oxygen content in the air around us or the oxygen supply decreases. This leads to an increase in the rate of oxygen intake by blood and a subsequent increase in the carbon dioxide released.

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