Answer:
I am a desire to munch
I am always around you but often forgotten. I am pure and clean most time but occasionally rotten.
I make everyone blind. You can't see me but I will always come back for you. What am I?
I produce wool and spit a lot
The 8 of us go forth and not back to protect our king from a foe's attack. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.