Question

osmosis is...
movement of water molecules across a membrane from low to high concentration of water
movement of water molecules across a membrane from high to low concentration of water

Explanation:

Osmosis is defined as the movement of water molecules across a semi - permeable membrane from an area of high water concentration (low solute concentration) to an area of low water concentration (high solute concentration). So we check the two options: the first option says movement from low to high concentration of water (which is incorrect), the second option says movement from high to low concentration of water (which matches the definition of osmosis).

Answer:

The option with the text "movement of water molecules across a membrane from high to low concentration of water"