Why the monomers of lipids include fatty acids and glycerol?

Lipids are primarily composed of fatty acids and glycerol, which serve as their monomers. Fatty acids are long hydrocarbon chains that can be saturated or unsaturated, influencing the properties of the lipid. Glycerol, a three-carbon alcohol, acts as a backbone to which fatty acids are attached, forming structures like triglycerides and phospholipids. Together, these components contribute to the diverse functions of lipids, including energy storage, insulation, and forming cellular membranes.