Answer:
I am black when I am clean and white when I am dirty?
I never was but always will be. No one ever saw me but everyone knows I exist. I give people the motivation to better themselves every day. What am I?
Only one color, but not one size. Stuck at the bottom, yet easily flies. Present in sun, but not in rain. Doing no harm, and feeling no pain.
What is up that’s also down? What’s a smile and a frown?
What goes in, but never through? I've got some and so do you. We might lend one, or even two, but only if our trust is true.
What is so fragile that saying its name breaks it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?