Question

define osmosis. in which direction does water move across membranes, up or down the concentration gradient?

Explanation:

Osmosis is the diffusion of water across a semi - permeable membrane from an area of lower solute concentration (higher water concentration) to an area of higher solute concentration (lower water concentration). Water moves down the concentration gradient during osmosis.

Answer:

Osmosis is the diffusion of water across a semi - permeable membrane. Water moves down the concentration gradient.