Which form of passive transport requires a pressure gradient to drive the activity of molecules?

Question

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Filtration is the form of passive transport that requires a pressure gradient to drive the activity of molecules. This involves the movement of molecules or particles across a selectively permeable membrane from an area of higher pressure to an area of lower pressure. Examples of filtration include the movement of water and small solutes through the walls of capillaries in the kidneys to form urine.

Which Form of Passive Transport Requires a Pressure Gradient to Drive