It is not proper to breathe through our mouth because:

the dust particles would enter our bodies

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more carbon dioxide will be inhaled

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our throat will become sore

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we will catch cold easily

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Solution

The correct option is A the dust particles would enter our bodies
It is not proper to breathe through our mouth because most of the dust particles can enter our body along with the air we breathe in. But breathing through nose does not allow to enter dust because nose has hair present which traps the dust particles.

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