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 ).

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.