Which provides long-term energy storage? glycogen, because it is a polysaccharide glucagon, because it is a complex protein glucose, because it is a monosaccharide cellulose, because it is a complex carbohydrate

Glycogen serves as a fantastic long-term energy storage molecule in animals, primarily found in the liver and muscle tissues. When your body needs energy, glycogen can be broken down into glucose, making it readily available for cellular processes, especially during exercise or fasting. It's like your body's built-in reserve tank! On the flip side, while cellulose is indeed a complex carbohydrate, it primarily functions as a structural component in plant cell walls and is not used for energy storage in the same way glycogen is. Humans can’t digest it for energy, which is why eating fiber helps keep our digestive system running smoothly. Think of it as nature's brush to clean out your pipes!