Look at the diagram, which shows the process of diffusion. Then, answer the question.
membrane
Public Domain
Why will the molecules move from right to left through the cell membrane?

A) Molecules will move from an area of higher concentration to an area of lower concentration

B)Molecules will move from an area of lower concentration to an area of high concentration

C)Molecules will move in the opposite direction from the flow of cytoplasm.

D)Molecules will move in the same direction as the flow of cytoplasm

A

Explanation:

Diffusion is the movement of water vapor from regions of high concentration (high water vapor pressure) toward regions of lower concentration.

Why will the molecules move from right to left through the cell membrane?

This question is the same as why diffusion and not osmosis.

Osmosis is the phenomenon that explains the net movement of solvent molecules, usually water, from a region of high solvent potential to a region of lower solvent potential through a partially permeable membrane.

In the question above

We see that difussion of these molecules will move from an area of higher concentration to an area of lower concentration. Note the solute molecules in context is applicable for diffusion.

So A is the answer.