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प्रश्न
Explain why you are not able to breathe normally when you are in closed and crowded places?
उत्तर
In a closed and crowded place, the number of people is more. All of them breathe out carbon dioxide. Therefore the amount of CO2 in the air is much more than the amount of oxygen available for inhalation. Therefore we find it difficult to breathe in a closed and crowded place.
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