Which best describes the difference between osmosis and diffusion? osmosis is the movement of particles from a high to a low particle concentration, while diffusion is the movement of water from a high to a low water concentration. diffusion is the movement of particles from a high to low particle concentration, while osmosis is the movement of water from a high to a low water concentration. diffusion is the movement of particles from a low to a high particle concentration, while osmosis is the movement of water from a low to a high water concentration. osmosis is the movement of particles from a low to a high particle concentration, while diffusion is the movement of water from a low to a high water concentration.