An Elevator
The point that moves (if none a new point is made) goes up or down the graph. Up is a positive number. Down is a negative number.
your age, your height , and possibly your weight
Oxygen :)
Your hand...
it was not just one person :P in goes way back, to the first people that just simply used rocks as stairs
The temperature It could also be a piano scale or a staircase.
Anything that moves can the real answer to the riddle is carpet
A stock market, it goes up and down but never move
Stairs, you go up you go down but the stairs never move.
TV channels
an elevator
roads?
The temperature It could also be a piano scale or a staircase.
stairs
steps
A rug
AN OLD MOTHER TRUCKER