Simple diffusion and facilitated diffusion share which of the following characteristics?

In contrast to primary and secondary active transpo, neither facilitated diffusion nor simple diffusion requires additional energy and therefore, can work in the absence of ATP. Only facilitated diffusion displays saturation kinetics and involves a carrier protein. By definition, neither simple nor facilitated diffusion can move molecules from low to high concentration. The concept of specific inhibitors is not applicable to simple diffusion that occurs through a lipid bilayer without the aid of protein.