What do all macromolcules have in common with each other?

All macromolecules—proteins, nucleic acids, carbohydrates, and lipids—are large, complex molecules essential for various biological functions. They are primarily composed of smaller subunits: amino acids for proteins, nucleotides for nucleic acids, monosaccharides for carbohydrates, and fatty acids and glycerol for lipids. Additionally, they are formed through polymerization, where smaller units are chemically bonded to create larger structures. Despite their diverse functions and structures, they all play critical roles in the growth, development, and maintenance of living organisms.