Which statement best describes diffusion and osmosis?

Which statement best describes diffusion and osmosis?

• A. Diffusion moves substances from higher to lower concentration; osmosis is diffusion of water across a selectively permeable membrane.
• B. Osmosis moves water molecules through any barrier regardless of selectivity.
• C. Diffusion always requires energy input.
• D. Osmosis is the movement of solute particles from high to low concentration.

Answer: (A)