Final answer:
Both fatty acids, specifically triglycerides, and polysaccharides like starch and glycogen can serve as important energy stores in the cell.
Step-by-step explanation:
Both fatty acids and polysaccharides can serve as important energy stores in the cell. Fatty acids, specifically triglycerides, are a form of long-term energy storage in animals. They store about twice as much energy as carbohydrates and are made up of glycerol and three fatty acids. On the other hand, polysaccharides like starch and glycogen serve as energy stores in plants and animals respectively. They are formed by the linkage of monosaccharide units and can be broken down into individual monosaccharides for energy production.