Living organisms break down polysaccharides into
simple sugars.
complex monomers.
complex carbohydrates.
simple polymers.

Answer is simple sugars.

Polysaccharides are polymers which are made from simple sugars called monosaccharides such as glucose, fructose. The bond between two simple sugars is called a glycosidic bond. Living organisms break down the polysaccharides into simple sugars by breaking the glycosidic bond.  

The living organisms carried out the breakdown of polysaccharides into simple sugar during the process of digestion. This process involves a series of enzymatic reactions as well as breakage of glycosidic bond.

Further Explanation:

A polysaccharide is a long chain carbohydrate molecule. It is composed of monomers of simple sugars that are joined together by a glycosidic bond. The structure of polysaccharide is either branched or unbranched and composed of different types of monosaccharides. Glycogen is a type of storage polysaccharide found in humans and other vertebrates.

Glycogen is composed of monomers of glucose. It is a storage polysaccharide and is stored in the liver and muscle cells in the humans. The glycogen is breakdown into glucose during decrease in the blood glucose level and this process is called as glycogenolysis.

Cellulose is another example of polysaccharide and is a structural polysaccharide found in the found plants. It is also composed of monomers of glucose that are joined together by beta-1, 4-glycosidic bonds. It provides rigidity to the plant cell.

Learn more:

1. Learn more about aerobic and anaerobic respiration

2. Learn more about cellular respiration

3. Learn more about alcoholic respiration

Answer Details:

Grade: High School

Subject: Biology

Chapter: Biomolecules

Keywords:

Polysaccharides, sugars, glucose, storage, structural, cell, tissue, plant cell, animal cell, energy, metabolism, bonds.

that is wrong, its not thymus.