Your who nasal cavity is like a big filtering system to sum it up real fast.
If its really cold the nasal passages heat the air up before they hit the lungs
ever blow your nose after a windy day.....they'll be a bunch dirt in your snot, thats the function
smell is one of the 5 senses but its not a mandatory one like touch sight and hearing, taste and smell aren't really important because without them you can still function properly .
You can go to the link to find other answers :
answers.yahoo.com
If its really cold the nasal passages heat the air up before they hit the lungs
ever blow your nose after a windy day.....they'll be a bunch dirt in your snot, thats the function
smell is one of the 5 senses but its not a mandatory one like touch sight and hearing, taste and smell aren't really important because without them you can still function properly .
You can go to the link to find other answers :
answers.yahoo.com