Final answer:
Glycogen is the primary storage form of carbohydrates in the body, stored in liver and muscle cells, and is broken down into glucose when needed.
Step-by-step explanation:
The primary storage form of carbohydrate in the body is e. glycogen. Glycogen is made up of glucose monomers and is a highly branched molecule, usually stored in liver and muscle cells. Glycogen functions as the animal equivalent of starch. When the blood glucose levels decrease, the body breaks down glycogen into glucose in a process called glycogenolysis, maintaining the homeostasis of glucose levels in the bloodstream.