Answer:
I make things short but I am pretty long myself
Weight in my belly trees on my back nails in my ribs feet I do lack.
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.
I see what you see feel what you feel and hear what you hear. I know all of your moves before you make them. I even know the moves you didn't make.
Send poorly behaved children to me and let them sit here. What am I?
No matter how little or how much you use me, you change me every month.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic