Animals store energy by making a polymer called glycogen. which best describes the structure of glycogen?

Glycogen is a  polymer of glucose and it has branched structure.

Explanation:

Glycogen is made up of repetitive units of glucose. IT is a polysaccharide.

The glucose molecules are bonded by glycosidic bonds.

There is a linear chain of Glucose molecules residues are linked linearly by α-1,4 glycosidic linkages. the branching starts after 10-12 glucose units by  α-1,6 glycosidic linkages.

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.