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Two or more kinds of alkenes (a type of monomer) can combine to form a polymers. Alkenes are a smaller kind of molecule that are joined through covalent bonds to form polymers (a larger molecule) and produce a different kind of substance.

To create polyester two different kinds of monomers called ETHENE and PROPENE are needed to make double bonds in the chemical reaction.

Answer:

Monomer - terephthalic acid and ethylene

Explanation:

Polyester is also known as polyethylene terephthalate (PET) and the two monomer that combine to produce polyester are terephthalic acid and ethylene

Polyester can be produced from two other sets of monomers also such as  monomers containing one carboxyl group and one hydroxyl group.

An example of this kind of polyester is one made up of lactic acid and glycolic acid.