Can you solve this riddle?

There is a green glass door in the middle of Minnesota. Only certain things can go through the door. Here is a list of things that can and cannot go through the door: Can: A riddle. Can't: An answer. Can: Root beer. Can't: Soda. Can: Grass. Can't: Field. Can: Tree. Can't: Bark. Can: Pool. Can't: Water. Can: Roof. Can't: Ceiling. What do all of the things that can go through the door have in common?

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