Here's why:

* Long chain-like molecule: Polymers are large molecules made up of many smaller repeating units called monomers.

* Repeating units: These monomers are linked together in a chain-like structure, forming the long polymer molecule.

Examples of polymers include:

* Polyethylene: A plastic made from repeating ethylene units.

* DNA: A biological polymer made from repeating nucleotide units.

* Proteins: Made from repeating amino acid units.

Let me know if you'd like more details about polymers!