Answer:
What is brown and sticky?
I am the kind of food monkey likes and people slip on me and fall in cartoons.
I am black when you buy me, red when you use me. When I turn white, you know it's time to throw me away. What am I?
I run up and down the stairs without moving. What am I?
I'm light as a feather yet the strongest person can't hold me for more than a few minutes. What am I?
No matter how little or how much you use me, you change me every month.