The principle role for sugars in living things is to

The principle role for sugars in living things is to provide energy to the body.

Explanation: Sugars are the Carbohydrate molecules. Sugar provide essential energy to body where it needed in the body.

Complex Carbohydrates made up of many monosaccharide molecules

( simple sugar ). Cells in the body with help of essential enzymes break down complex sugar into simple sugar ( glucose ).

By the process of cellular respiration food energy is converted into usable energy source adenosin triphosphate ( ATP ).

"it built up in the atmosphere"

i think thats it, idk, i tried looking for this exact q& a for grad. and idk if i got this question right or sorry if im wrong