Positive feedback
It allows you to see where you need to improve and how other viewed your performance.
Well, It cannot be A. as the trachea is the windpipe, so its not separated.
I think your answer is definitely C. because that says exactly what the nose does so it makes it true and the other ones are false.
Hope I helped :)
never would be but if it does occur it would be rarely
Your breath smells better
Stained teeth get whiter
Bad smelling clothes and hair go away
Your yellow fingers and fingernails disappear
Food tastes better
Your sense of smell returns to normal
Everyday activities no longer leave you out of breath (such as climbing stairs or light housework)
Because you need to make sure that your dishes and things are clean, and not dirty, so you can use them again and all that.