Correct the following statements by changing the underlined part of the sentence.
`ul("Both polystyrene and terylene are addition polymers.")`

Explanation

To correct the statement "Both polystyrene and terylene are addition polymers," we need to analyze the nature of both polymers.

1. **Identify the nature of polystyrene**:
- Polystyrene is formed from the polymerization of styrene, which involves the addition of monomer units without the loss of any small molecules. Therefore, polystyrene is indeed an addition polymer.

2. **Identify the nature of terylene**:
- Terylene, also known as Dacron, is formed from the polymerization of terephthalic acid and ethylene glycol. This process involves the elimination of water molecules during the formation of ester bonds, which classifies terylene as a condensation polymer.

...