Question

question 21 1 pts which type of passive transport refers to the movement of only water molecules across a membrane? diffusion osmosis facilitated diffusion active transport

Explanation:

Osmosis is a type of passive transport where only water molecules move across a semi - permeable membrane from an area of higher water concentration to an area of lower water concentration. Diffusion can involve movement of various substances, facilitated diffusion is for substances that need a carrier protein and active transport requires energy and is not passive.

Answer:

B. osmosis