Whats green and goes up and down all day??!

Question: Whats green and goes up and down all day!?!?
Answers:

a pea in an elevatorWww@Enter-QA@Com

green caterpilerWww@Enter-QA@Com

Grasshopper!.Www@Enter-QA@Com

A LEAFWww@Enter-QA@Com

a leaf
i!.e!., if its windyWww@Enter-QA@Com

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