Answer:
At first, I am nothing. Add something to negate. Add again to oppose. Add again to find the time to draw. Add once more to find nobody at all.
I cost no money to use, or conscious effort to take part of. And as far as you can see, there is nothing to me. But without me, you are dead.
Dies half its life. Lives the rest. Dances without music. Breathes without breath.
What goes up when the rain comes down?
What wears a coat in the winter and pants in the summer?
Why was the cook arrested?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?