functions

Cellulose

Glycogen

Starch

the cellulose is an important cell wall componentAnimals that are capable of digesting cellulose may derive their energy from this polysaccharide. Humans cannot digest cellulose due to the lack of necessary enzymes..

is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals, fungi, and bacteria

one of two forms of energy reserves, glycogen being for short-term

The main function of starch is as way to store energy for plants.

Starch is a source of sugar in an animal's diet.

Chitin

The main function of this chitinto keep the inner soft tissue safe from any sort of injury. Most importantly, it prevents these delicate tissues from becoming dry. In short, it acts as a watertight barrier against dehydration, which is crucial for their survival