Glycogen is a molecule that contains many glucose molecules. Which best describes glycogen? A. Glycogen is a lipid and helps the body use energy.
B. Glycogen is a polysaccharide and helps the body use energy.
C. Glycogen is an amino acid and is used as a building block for other materials.
D. Glycogen is a nucleic acid and is used as a building block for other materials.

d. cellulose and starch

the correct answer is option d.

an appositive is a noun, noun phrase or noun clause which follows another noun or noun phrase in order to describe it or name it another way. they are usually used between commas, brackets or dashes.

the example sentence with the correct use of commas is the following:

her uncle, the man over there in the red shirt, owns the hardware store in town.

answer///malignant melanoma;