Final answer:
The advantage of constructing protein and carbohydrate macromolecules as polymers is that it allows for a greater diversity and complexity of structures and functions.
Step-by-step explanation:
The advantage of constructing protein and carbohydrate macromolecules as polymers is that it allows for a greater diversity and complexity of structures and functions. By combining a relatively small number of different types of monomers in different orders, proteins and carbohydrates can have a wide variety of functions in living organisms. For example, proteins can act as enzymes, catalysts that increase the rate of biological reactions, while carbohydrates can serve as energy sources or structural elements.