Answer: It describes water molecules moving across a membrane, which allows the water molecules to pass in and out freely, but forbids the motion of other molecules.
Explanation:
A in Biology class last year.
Osmosis is really just a special case of facilitated diffusion because it
doesn't permit the movement of some molecules.
Osmosis can be defined as the movement of solvent molecules such as
water from a region of higher concentration to a region of lower
concentration through a semi-permeable membrane.
Osmosis is however a special case of facilitated diffusion because it permits
the movement of water molecules and inhibits the movement of other
molecules such as sugar etc.
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