Question

Which phrase best defines diffusion?

A. movement through a cell membrane using energy from ATP

B. movement of particles from a region of low concentration to a region of high concentration

C. active transport of particles up a concentration gradient

D. movement of particles from a region of high concentration to a region of low concentration

Answer 1

D movement of particles from a region of high concentration to a region of low concentration.

Explanation: I took the test

Answer 2

Diffusion is a movement of particles from a region of high concentration to a region of low concentration.

Hope this helps