Final answer:
Polysaccharides are complex carbohydrates made up of long chains of glucose units. They serve as energy storage or make up structures in living organisms.
Step-by-step explanation:
Polysaccharides, also known as complex carbohydrates, are made up of long chains of glucose (sugar) units.
They include starch, glycogen, cellulose, and chitin.
Complex carbohydrates serve as energy storage or make up certain structures in living organisms.