Staggered work times and flexible working may alleviate some public transport crowding ... car use is unfeasible and potentially environmentally unfriendly. Up to 90% of active commuters walking or ...

Animals therefore use active transport to absorb glucose into the blood under these conditions. The process requires energy produced by respiration.

eg urea No Osmosis Water moves from a high to a lower concentration across a partially permeable membrane and down a concentration gradient Water No Active transport Substances more from low to ...