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

Answer;

Simple sugars

Explanation;

-Living organisms break down polysaccharides into simple sugars.

-Polysaccharides are a type of carbohydrates that are formed when many monomers of monosaccharides or simple sugars are joined by glycosidic bonds through condensation process.

-Simple sugars or monosaccharides are the simplest form of carbohydrates, they include, glucose, fructose, etc. Living organisms such as humans break down polysaccharides into simple sugars. For example in humans glycogen which is a polysaccharides is broken down to glucose when the body dose not have enough glucose supply.