What are monosaccharides made of

Carbohydrates (also called saccharides) are molecular compounds made from just three elements: carbon, hydrogen and oxygen. Monosaccharides (e. g. glucose) and disaccharides (e. g. sucrose) are relatively small molecules. They are often called sugars.

any of the class of sugars (e. g., glucose) that cannot be hydrolyzed to give a simpler sugar.