Answer:
by breaking down food molecules and transferring their chemical energy to ATP
Explanation:
All living organisms require energy in order to perform their cellular functions. These energy is in form of ATP (Adenosine triphosphate), which is the usable form of energy by cells. Organisms are able to obtain this energy via a process called CELLULAR RESPIRATION.
Cellular respiration involves the breaking down of glucose molecule (derived from the food intake) in a series of metabolic reactions to yield ATP (energy). In other words, organisms breakdown food molecules and transfer the chemical energy stored in their bonds into ATP.