Answer:
I have roots that no one sees and I am taller than trees. Up, up I go, but never do I grow. What am I?
What gets sharper the more you use it?
What has keys but no locks a space but no room and you can enter but can't go in?
In the sun I like to play; in the rain I goes away; walk or run I always follow; in the mud I always wallow.
An open ended barrel I am shaped like a hive. I am filled with the flesh and the flesh is alive.
Long and slinky like a trout, never sings till it's guts come out.