1. what are polymers? small groups of halogen molecules long chains of halogen molecules small groups of carbon molecules long chains of carbon molecules

Long chains of carbon molecules

Explanation: Polymers (for example things like plastic) are macromolecules composed of many repeated subunits (this is a "chain" where each link would be one of those subunits)

Most commonly the polymers consist mainly in carbon atoms (not always, there may be some exceptions)

So the correct answer would be option 4: Long chains of carbon molecules.

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