Question

question define diffusion. answer the movement of any substance through a cell membrane requiring the cell to expend energy the movement of molecules from a high concentration to a low concentration along the concentration gradient the movement of water across a membrane from a region of high concentration to a region of low concentration along the concentration gradient movement of materials into the cell using vesicles i dont know yet

Explanation:

Diffusion is the passive movement of molecules from an area of high concentration to low concentration along the concentration gradient, without energy use. The first option is active transport, third is osmosis, fourth is endocytosis.

Answer:

The movement of molecules from a high concentration to a low concentration along the concentration gradient