Final answer:
The basic unit of structure from which a polymer is constructed is a monomer. Monomers are small molecules that can bond together to form a polymer through covalent bonds. Polymerization is the process by which monomers combine to form a polymer.
Step-by-step explanation:
The basic unit of structure from which a polymer is constructed is called a monomer. Monomers are small molecules that can bond together to form a polymer through covalent bonds. When monomers combine, they release a small molecule, such as water. This process is known as polymerization.