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 ).

b brown mice / white sand dunes

your answer is going to be physical weathering