What makes osmosis a different phenomenon than diffusion?

A) Osmosis is a more random set of movements.
B) Osmosis has a directed movement, through a semipermeable membrane.
C) Osmosis only occurs through a nonpermeable membrane.
D) Nothing really; the two processes are virtually the same.

Osmosis

The movement of water molecules through a semi-permeable membrane from a region of low solute concentration to a region of high solute concentration to equalize the concentrations on both sides of the membrane.

Semipermeable Membrane

A type of membrane that allows certain molecules or ions to pass through it by diffusion and occasionally specialized "facilitated diffusion," while blocking others.

Diffusion

The process by which molecules move from an area of higher concentration to an area of lower concentration, driven by thermal energy.