Question

the spreading out of molecules from a center of higher concentration is the result of
multiple choice
the random movement of molecules.
the changes in turgor pressure.
the molecules trying to move to an area of lower concentration.
the use of atp at membrane channels.
the concentration of molecules.

Explanation:

Diffusion is the spreading of molecules from an area of higher concentration to an area of lower concentration. It occurs due to the random motion of molecules. Turgor pressure is related to plant - cell rigidity and not the cause of molecular spreading. Movement to lower concentration is the result, not the cause. Use of ATP at membrane channels is related to active transport, not simple diffusion. The concentration of molecules is a condition, not the cause of the spreading.

Answer:

the random movement of molecules.