Question

multiple choice question
without the expenditure of energy, the net movement of matter in a physiological gradient will always be from a region of ____ concentration to a region of ____ concentration.
o higher; lower
o lower; higher

Explanation:

This is based on the principle of diffusion. Diffusion is the passive movement of substances from an area of higher concentration to an area of lower concentration without the use of energy.

Answer:

higher; lower

So the correct option is: higher; lower (the first - listed option in the multiple - choice).