Answer:
Upon me you can tread, though softly under cover. And I will take you places, that you have yet to discover. I'm high, and I'm low, though flat in the middle. And though a joy to the children, adults think of me little.
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.
Look into my face and I'm everybody. Scratch my back and I'm nobody.
What goes with a car, comes with a car, is no use to a car but a car cannot move without it?
Forward Iām heavy, but backwards Iām not.
What did the piece of wood say when he saw the screwdriver and screws approaching?