What class of biomolecule includes fats, phospholipids, steroids, and waxes?

Lipids are a diverse group of hydrophobic biomolecules characterized by their insolubility in water and solubility in organic solvents. This class includes fats, which are primarily used for energy storage, phospholipids that form the structural basis of cell membranes, steroids that serve as signaling molecules and structural components, and waxes that provide protection and water retention in various organisms. The common feature among all lipids is their fatty acid structure, which contributes to their hydrophobic properties. This distinct classification is defined by the chemical nature and functional roles of lipids in biological systems, making it clear why the correct answer pertains to this group.