Carbohydrates can be used for energy storage or to build structures. Plants store energy as A and animals store energy as B. Plants build structures out of C.

A. starch

B. glycogen

C. cellulose

Explanation:

Molecules of carbohydrates providing energy and support consist primarily of sugar polymers.  They are formed from monosaccharide monomers in long chains and rings. The basic composition of monosaccharides, disaccharides and polysaccharides comprises the elements C, H O, with several polar groups of OH.

Polysaccharides consist of glucose joined by 1-4 glycosidic bonds. They are used as energy storage in photosynthesis and used by animals in respiration, ethyl alcohol fermentation and lactic acid fermentation for ATP synthesis. Plants transport glucose as sucrose, and store it as starch, while animals store glucose as glycogen.

Glucose is readily converted into another form of chemical energy as ATP. Plants also make up insoluble and stable cellulose and lignin structural units in plants.

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