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For heat and moisture exchange.
Clears the nasal passages, because a sneeze is caused by irritation or itchiness in your nose or nasal passages.
No, as they have no lungs or nasal passages.
nostrils
nasal septum
Large nasal passages conserve water because there are many convolutions. These make air move back and forth quickly, and the moisture hits the convolutions and is absorbed back into the body.
deviated septum
No, clams don't have nasal passages or lungs.
the uvula
between the nasal passages and the diaphragm
Lets you smell and filters out germs
No, if there were it would be called clear nasal passages.