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Fine hairs are present to filter the air from dust particles. and mucus is present to cool the warm air.
We should not take air from our mouth because if we inhale air from our mouth then the air will be warm and it will be impure.
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Our nose contains fine hair and mucus (a sticky substance) in order to prevent dust particles from getting into the respiratory system.It is harmful when we inhale smoke especially in large quantities.This is why it is not advisable to breathe through the mouth.It makes us consume harmful dust particels.
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