Answer:
If I have it, I don't share it. If I share it, I don't have it. What is it?
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around.
What can be underwater, under fire, on fire and taking water all at the same time?
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.
Hard to catch, easy to hold. Can't be seen, unless it's cold.
I have two eyes in the front and a lot of eyes on my tail
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?