Answer:
So simple, that I can only point. Yet I guide men all over the world.
I am the place to turn when nature calls.
My first is in window but not in pane. My second's in road but not in lane. My third is in oval but not in round. My fourth is in hearing but not in sound. My whole is known as a sign of peace. And from noah's ark won quick release.
What is the difference between a poorly dressed man on a bike, and a well-dressed man on a unicycle?
I am between earth and heaven. What am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?