What are they?

Monomers - a molecule that can bind to other molecules to make BIGGER molecules.  They are building blocks!

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Polymers - the BIGGER molecules…...when 2 or more of the same monomers bond together (Polymerization)

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Macromolecules - A big molecule made up of different smaller molecules.  They can be made of just Polymers or just Monomers, or both at the same time.