what is the difference between simple diffusion and facilitated diffusion
Simple diffusion is a type of passive transport where no energy is required for molecules to move out or into the cell. However, there are times when large molecules cannot, on their own cross the plasma membrane and are helped across the membrane by carrier proteins. This process is known as facilitated diffusion.
There is another type of movement referred to as active transport where molecules get transported across the plasma membrane taking help of carrier proteins but energy is expended in the process that differentiates it from simple facilitated diffusion.