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 semi - permeable membrane (such as a cell membrane) from an area of high water concentration to an area of low water concentration. It does not involve the movement of solutes down a concentration gradient, nor the movement of water up a concentration gradient, and it doesn't require the help of proteins for the basic process.

Answer:

movement of water across a cell membrane