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Nostrils are mainly what the human race breathes out of, but, other than that purpose, they also help protect it by:

Having hairs: the hairs on the inside of your nose (Yes, everybody has them) trap foreign materials.

Mucus: the mucus on the inside of your nose also traps foreign materials. This is also why we get Allergies. Foreign materials enter and the body's response is to create mucus along the nostrils to protect your respiratory tract further.

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15y ago

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