Glycogen, anaturally occuring polymer stored in animals is a

polysaccharide

The correct answer is 4. polysaccharide.

Glycogen is a polysaccharide, which means that it is a polymer made up of many sugar molecules. It is the main storage form of glucose in animals, and it is found in the liver and muscles. Glycogen is a branched polymer, which means that it has a tree-like structure. This structure allows glycogen to be broken down and stored more efficiently than a linear polymer.

Monosaccharides are the simplest type of sugar, and they cannot be broken down into smaller units. Disaccharides are made up of two monosaccharides, and trisaccharides are made up of three monosaccharides. Glycogen is much larger than a disaccharide or trisaccharide, and it is made up of thousands of monosaccharide units.

So, glycogen is a polysaccharide, not a monosaccharide, disaccharide, or trisaccharide.