which provides long - term energy storage?\nglycogen, because it is a polysaccharide\nglucagon, because it…

Brief Explanations:

• Glycogen is a polysaccharide. In animals, it serves as a long - term energy storage molecule. When the body needs energy, glycogen can be broken down into glucose.
• Glucagon is a hormone (a protein) that regulates blood glucose levels by promoting glycogenolysis (breakdown of glycogen) and gluconeogenesis (synthesis of glucose from non - carbohydrate sources), but it is not an energy storage molecule.
• Glucose is a monosaccharide and is the immediate source of energy for cells, not a long - term storage form.
• Cellulose is a complex carbohydrate (a polysaccharide) that forms the structural component of plant cell walls and is not used for energy storage in animals.

Answer:

glycogen, because it is a polysaccharide