Answer:
I tremble at each breath of air and yet can heaviest burdens bear.
Drop me and the world will shatter. You can always find me where you empty your bladder.
I run up and down the stairs without moving. What am I?
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
I can swim but never get wet. I can run but never get tired. I follow you everywhere but never say a word.
In birth I spring forth, in life I unfold. In death I wilt and die, but rebirth restores all.