State the characteristic difference between linear polymers and cross-linked polymers.

Explanation

### Step-by-Step Solution:

1. **Definition of Polymers**:
- Polymers are large molecules made up of repeating structural units called monomers. These monomers are linked together through chemical bonds.

2. **Linear Polymers**:
- Linear polymers consist of monomers arranged in a straight chain.
- They have a one-dimensional structure where each monomer is connected to the next in a sequential manner.
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