Match the transport process to its description.
a. simple diffusion
b. facilitated diffusion
c. both
d. neither the movement of molecules from an area of high concentration to an area of low concentration

C. Both

Explanation:

The movement of molecules from an area of high concentration to an area of low concentration is called Diffusion.

In simple difussion the movement of molecules is driven by a gradient in concentration in a solution or across a semipermeable membrane.

Unlike simple diffusion, in facilitated diffusion  membranes incorporate specialized membrane proteins which help transport substances across the membrane, and also the direction of transport is always down a concentration gradient, from an area of high concentration to an area of low concentration.

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