A particular membrane transport process exhibits saturation,uses carrier molecules,but does NOT require ATP.The process is probably

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Facilitated diffusion is a type of passive transport that uses carrier or channel proteins to move molecules across the membrane, but it can become saturated if all the transporters are occupied. It does not require ATP, unlike active transport. Osmosis is the movement of water molecules from high to low concentration and does not involve carrier molecules. Phagocytosis and pinocytosis are both types of endocytosis, where the cell membrane invaginates and engulfs extracellular material, but they require ATP and do not involve carrier molecules.

A Particular Membrane Transport Process Exhibits Saturation,uses Carrier Molecules,but Does