Which is a characteristic of addition polymerization?
each monomer has more than one functional group.
the polymer contains all the atoms in the monomer units.
the polymer contains only some of the atoms in the monomer units.
a small molecule, such as water, is produced during the reaction.

The correct statement is the polymer contains all the atoms in the monomer units.

Explanation:

Polymerization is defined as the process in which small unit known as monomer react together to form a long three-dimensional chain known as polymer.

Addition polymerization is a process in which no loss of atoms or molecules is seen when monomers react together. For Example: Monomer ethene react together to form polyethene.

Hence, the correct statement is the polymer contains all the atoms in the monomer units.

i'm not sure

explanation:

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