Holt Modern Biology 1st Edition by John Postlethwait ,Janet Hopson

تمرين 33

DIRECTIONS: Choose the letter of the answer choice that best answers the question. During diffusion, molecules tend to move in what direction?
A) the molecules involved in diffusion never move
B) in a direction that doesn't depend on the concentration gradient
C) from an area of lower concentration to an area of higher concentration
D) from an area of higher concentration to an area of lower concentration