Active transport occurs in cells, for example, when the Na-K pump is at work. Any process that involves active transport most often involves the
Responses
A movement of molecules without any predictable pattern.movement of molecules without any predictable pattern.
B movement of molecules from a lower concentration to a higher concentration.movement of molecules from a lower concentration to a higher concentration.
C movement of molecules from a higher concentration to a lower concentration.movement of molecules from a higher concentration to a lower concentration.
D movement of molecules from a lower to higher concentration and then back to the point of origin.