When you sleep you are most likely laying down. Without all the gravity pushing down on your spine your spine can expand. Throughout that day gravity pushes down on your spine and it causes your spine to shrink.
The answer to the question is True.
The right option is; -the single layer membrane surrounding the outside of the cell allows for the easy removal of waste
The cell membrane is a biological membrane that surrounds a cell and separates the contents of the cell from its external environment. The cell membrane is composed of lipids and proteins and its main function is to protect the cell from its surroundings. The cell membrane also controls the molecules that enter and leave cell.
I think its A
A dog will bark at animals and cars, but only if the environment permits.
-Seth
