What does an uniformity in a sequence of rock layers reveal about geologic history? a. a rock layer must of turned upside down b. a layer of rock might have eroded c. the layers must cover hundreds of square miles d. the layers must have deposited very quickly

✿   this landform has a high elevation and a high relief

✿   this landform is a mountain

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.