Answer:
Tomorrow's yesterday. Yesterday's tomorrow. What is it?
What is filled with air and sometimes a gas, tied to a string and often seen on your birthday?
What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.
Kids play it and Michelangelo sculpted with it.
What goes up when rain comes down?
An open ended barrel, it is shaped like a hive. It is filled with the flesh, and the flesh is alive!