Answer:
Give it food and it will live, give it water and it will die.
You throw me out when you want to use me and you take me in when you don't want to use me. Who am I?
What begins and has no end? What is the ending of all that begins?
We are few to the wise; We are abundant to the drunken; We can calm the beast and are precious to the child; We can devour the heart, without piercing the skin
It's equally comfortable in an orchestra and a geometry textbook. What is it?
What never gets any wetter no matter how hard it rains?