Why does a mountain range often cause precipitation to fall a ocean currents can’t flow through it b air must rise and cool to pass over it c the climate is generally cooler at higher elevations d the gravitational attraction of the mountains pulls harder in raindrops

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

digestion

it excretes wastes