cellular transport Tools A B Brownian motion random movement of particles due to kinetic energy diffusion net movement of particles to an area of higher consentration to an area of lower the rate of diffusion is affected by what? concentration,temp.and pressure concentration gradient diiference in concentarion of substances across a space diffusion cannot occur unless a substance is in.......concentrationn higher osmosis diffusion of water across a slective permable membrane the three types of solutions are? hypotonic,isotonic,and hypertonic passive transport movement across a selective permable membrane by diffusion iso means? same tonic means? to stretch hypo means? under Hyper means? over the cell must use energy to move particles to counteract the force of diffusion, energy is supplied by...... ATP