Answer:
transport of substances across a biological membrane through a concentration gradient
Explanation:
if im wrong im deeply sorry, im not good at this but ill find an internet explination>
Main Difference – Simple Diffusion vs Facilitated Diffusion
Simple diffusion and facilitated diffusion are two types of passive transport methods in which the cell membrane transports molecules across it. It uses natural entropy to move molecules from higher concentration to a lower concentration until the concentration becomes equalized. Hence, no ATP energy is used for the transportation of molecules. There are four main types of passive transport: osmosis, simple diffusion, facilitated diffusion and filtration. The main difference between simple diffusion and facilitated diffusion is that simple diffusion is an unassisted type of diffusion in which a particle moves from higher to a lower concentration across a membrane whereas facilitated diffusion is the transport of substances across a biological membrane through a concentration gradient by means of a carrier molecule.
