Answer:
Feed me and I live, give me drink and I die.
Without this, eating food and Steven Spielberg's career would be very different.
I cannot be felt, seen or touched. Yet I can be found in everybody. My existence is always in debate. Yet I have my own style of music.
I go around in circles, but always straight ahead. Never complain, no matter where I am led.
Face with a tree, skin like the sea. A great beast I am. Yet vermin frightens me.
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?