The cellular process diffusion does not require cellular to reach equilibrium. Similarly, uses a selectively permeable membrane to reach equilibrium. This Membrane allows to pass through, but not soluble particles or molecules. It too does Not require cellular energy. When molecules cannot move through a cell membrane passively, the Cell uses a process called. This process uses found in the cells Membrane to pass particles and reach equilibrium.

b. lithosphere, asthenosphere, mesosphere   is the answer most likely

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.