The diffusion of substances within a solution tends to move those substances their gradient. Select one: a. Down; Concentration b. Up; electrochemical c. Up; electrical d. Down; Pressure

The answer is A.

Explanation:

Diffusion is a net movement of molecules where it travels from a region of high concentration to a region of low concentration down a concentration gradient.

a- down their concentration gradient.

explanation

thats just how diffusion works.

it's the movement of particles from a places with higher concentration to a place with a lower concentration. That means it goes down a concentration gradient.