Answer:
What goes up a chimney down but can't go down a chimney up?
Some will use me, others not. Some have remembered, others forgot. For profit or gain, I'm used expertly. I can't be picked off the ground or tossed into the sea. What am I?
When you take away the whole from me there is always some left.
I am heavy forward, but backward I'm not. What am I?
Use me if you really want to see inside someone
A little house full of meat, no door to go in and eat.