A molecule made of many repeating parts is known as a polymer.

Here's a breakdown:

* Polymer: A large molecule composed of many smaller repeating structural units called monomers.

* Monomer: A small molecule that can join with other similar molecules to form a polymer.

Examples of polymers:

* Polyethylene (plastic): Made from repeating units of ethylene.

* DNA: Made from repeating units of nucleotides.

* Proteins: Made from repeating units of amino acids.

* Starch: Made from repeating units of glucose.

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