Asphalt driveways are typically less expensive than concrete, costing a minimum of about $2.50 per square foot. An asphalt driveway might last just 20 years; however, while a concrete driveway can last more than 30.
Semipermeable membrane. The diffusion of water through a selectively permeable membrane is called osmosis.This allows only certain particles to go through including water and leaving behind the solutes including salt and other contaminants. In the process of reverse osmosis, thin film composite membranes (TFC or TFM) are used.
a special case of diffusion where water diffuses through a selectively permeable membrane from a region of higher water potential to a region of lower water potential Permeable Membrane a membrane that allows for diffusion of certain solutes and water Active Transport uses energy from ATP to move substances throguh the cell membrane against a concentration gradient, from regions of low to higher concentrations