Question

which process does osmosis involve?
o movement of particles across a membrane with the help of proteins
o movement of water across a cell membrane
o movement of water up a concentration gradient
o movement of a solute down a concentration gradient

Explanation:

Osmosis is the diffusion of water across a selectively - permeable cell membrane from an area of higher water concentration to an area of lower water concentration. It does not involve the movement of solutes or the help of proteins for water movement. Water moves down its concentration gradient in osmosis.

Answer:

movement of water across a cell membrane