Final answer:
Nylon and polyester are synthetic polymers made up of repeating units. The number '100' is used to denote the denier or thickness of nylon or polyester fabrics.
Step-by-step explanation:
Both nylon and polyester are synthetic polymers, which means they are made up of long chains of repeating units. Nylon is made from a diamine and a dicarboxylic acid, while polyester is made from a diol and a dicarboxylic acid. The number '100' is often used to denote the denier or thickness of the fiber in nylon or polyester fabrics.
Learn more about Synthetic Polymers