Answer:
Tall in the morning, short at noon, gone at night. But I'll be back soon.
I am the tool, for inspiring many. Buy me in the store, for not much more than a penny. Don't overuse me, or my usefulness will go.
If I have it, I don't share it. If I share it, I don't have it. What is it?
It's equally comfortable in an orchestra and a geometry textbook. What is it?
Runs smoother than any rhyme, loves to fall but cannot climb!
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.