Final answer:
Monomers are linked together by dehydration synthesis and broken down into monomers by hydrolysis.
Step-by-step explanation:
Monomers are linked together by dehydration synthesis (condensation) and broken down into monomers by hydrolysis. In dehydration synthesis, monomers combine with each other by releasing a water molecule as a byproduct, forming covalent bonds and creating polymers. Hydrolysis is the reverse process, where a water molecule is used to break the covalent bonds between monomers, resulting in the formation of monomers.