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 a) movement of molecules without any predictable pattern. b) movement of molecules from a lower concentration to a higher concentration. c) movement of molecules from a higher concentration to a lower concentration. eliminate d) movement of molecules from a lower to higher concentration and then back to the point of origin.

Abeaker of water was heated and then placed on a bench in the laboratory. the water cooled until it was the same temperature as the air in the laboratory. which of these explains the mechanism by which the water cooled? a. heat energy was transferred from the water to the air. b. water molecules from the water formed warm water currents. c. the water molecules absorbed energy from the molecules in the air. d. the water released radiation until it contained no heat energy.