Final answer:
The breakdown of glucose and fatty acids in animals produces adenosine triphosphate (ATP), which provides energy for cellular processes.
Step-by-step explanation:
The main function of the breakdown of glucose and fatty acids in animals is to provide energy for chemical reactions by producing adenosine triphosphate (ATP). ATP is the molecule that carries energy within cells and is used to power various cellular processes. Animals use the oxygen they breathe in to convert the stored energy in glucose and fatty acids into ATP through a series of biochemical reactions in the mitochondria of their cells.
Learn more about Energy production in animals