A) dust particles will enter our lungs.
B) we will inhale more carbon dioxide.
C) our throat will become sore.
D) we will easily catch cold.
Correct Answer: A
Solution :
If we breathe air through our mouth, the dust particles present in the air may enter the lungs and cause harm. But if the nose is used for breathing, the hair present in the nose filters the air and prevents the dust particles from entering the lungs.
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