Here's why:

* Polymers are large molecules made up of repeating smaller units called monomers.

* Monomers are the building blocks of polymers.

* Copolymers are polymers made from two or more different types of monomers.

* Terpolymers are polymers made from three different types of monomers.

Therefore, a polymer containing up to 20 different kinds of monomers would be considered a multi-component copolymer with a high degree of complexity.