Answer:
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.
Large as a mountain, small as a pea, Endlessly swimming in a water-less sea.
The itsy bitsy teeny weeny yellow polka dot variety is quite popular.
Who lives in a house with one bedroom, 50 hallways, and ghosts lurking everywhere?
What goes in, but never through? I've got some and so do you. We might lend one, or even two, but only if our trust is true.
Often cooked as fillet, this meat comes from an animal that swims underwater.