Final answer:
Oxygen moves into a cell at a faster rate when there is a higher concentration of oxygen outside the cell, due to simple diffusion, a type of passive transport.
Step-by-step explanation:
Oxygen will move into the cell at a faster rate in the cell with a higher oxygen concentration outside. This is due to the process of simple diffusion, which is a form of passive transport where molecules move from an area of higher concentration to an area of lower concentration across the cell membrane. Since cells utilize oxygen rapidly during metabolism, there is typically a lower concentration of O2 inside the cell than outside. Hence, oxygen naturally diffuses into the cell. If the concentration of oxygen inside and outside the cell were equal, there would generally not be a net flow of oxygen across the cell membrane.