2.12 Understand definitions of diffusion, osmosis and active transport

Diffusion: The random movement of particles from an area of high concentration to an area of low concentration.

Osmosis: The random movement of water particles from an area of high water concentration to an area of low water concentration through a semi-permeable membrane

Active transport: The movement of ions or molecules across a membrane from an area of low concentration to an area of high concentration, assisted by enzymes and requiring energy.