Reputation: 1571. E-filed in Early February and it took about 7 weeks to get my refund. It might have something to do with the amount as well. I got back $1,500 from the state which is probably more than most people get, so it could have taken longer for the larger payment.
Diffusion and Osmosis. Diffusion. -the process by which molecules spread from areas of high concentration, to areas of low concentration. Concentration gradient - a difference between concentrations in a space. Molecules will always move down the concentration gradient, toward areas of lesser concentration.
Simple diffusion refers to diffusion of substances without the help of transport proteins. Facilitated diffusion refers to diffusion of substances across a cell membrane with the help of transport proteins. Dialysis refers to the diffusion of solutes across a selectively permeable membrane.