Final answer:
Monomers are the building blocks of macromolecules, similar to how links in a chain connect to make the entire chain.
Step-by-step explanation:
Monomers are considered the "building blocks" of macromolecules. They combine with each other using covalent bonds to form larger molecules called polymers. The best analogy for monomers is b) the links in a chain that connect to make the entire chain. Just like the links in a chain, monomers join together to form a polymer, creating a larger and more complex structure.