19. The movement of molecules from an area of higher concentration to an area of lower concentration is ca
a. Passive transport
c. Catalysis
d. Active transport



Answer :

Final answer:

Active transport involves moving molecules from low to high concentration with the use of energy.


Explanation:

Active transport is the movement of molecules across a cell membrane from an area of lower concentration to an area of higher concentration, requiring energy to accomplish this process. This is in contrast to passive transport where molecules move from an area of higher concentration to an area of lower concentration without the need for energy input. The principal force driving movement in diffusion is the concentration gradient.


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