Question

a monomer is a

chain of molecules

building block

large chain of building blocks

single atom

rewatch

Explanation:

A monomer is a small molecule that can bond together with other molecules to form a polymer. It serves as the basic unit or building block for polymers. A chain of molecules (like a polymer) is made up of monomers. A large chain of building blocks is a polymer (not a monomer). A single atom is not a monomer (a monomer is a molecule, which is made of atoms).

Answer:

building block