Answer:
I can be written, I can be spoken, I can be exposed, I can be broken.
Two bodies have I, though both joined in one. The more still I stand, the quicker I run.
Only two backbones and thousands of ribs.
To cross the water I'm the way, for water I'm above. I touch it not and, truth to say, I neither swim nor move.
What goes through a door but never goes in. And never comes out?
When is it bad luck to see a black cat?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?