Final answer:
Osmosis is a type of facilitated diffusion, where water moves through a semipermeable membrane from an area of higher water concentration to one of lower water concentration, assisted by proteins such as aquaporins.
Step-by-step explanation:
Osmosis fits under the membrane property known as facilitated diffusion. This biological process involves the movement of free water molecules through a semipermeable membrane according to the water's concentration gradient across the membrane.
Facilitated diffusion is essential for osmosis, as it enables water to move from an area of high concentration to an area of low free water molecule concentration without the expenditure of cellular energy (ATP), helped by aquaporin proteins that serve as water channels.