Which of the following statements about diffusion is not true? a. Diffusion is a natural process.
b. Molecules flow down their concentration gradient.
c. Molecules cannot move at equilibrium.
d. All of the above statements are true.

D is what I would put because it looks right

This is what i found on google “phytoplankton, tiny organisms that live in the ocean, are autotrophs. some types of bacteria are autotrophs. most autotrophs use a process called photosynthesis to make their food.” i hope this you for what your looking for