Question

which type of passive transport involves the movement of small molecules across the cell membrane, not specifically referring to the movement of water, from areas of high concentration to areas of low concentration?

Explanation:

Passive transport is a process where substances move across the cell membrane without the use of energy. Diffusion is a type of passive transport that involves the movement of small molecules (other than water) from an area of high concentration to an area of low concentration. Osmosis is specifically the movement of water. Since the question excludes water movement, diffusion is the relevant process.

Answer:

Diffusion