Is`(NH-CHR-CO)_(n)`a homopolymer or copolymer?

Explanation

To determine whether `(NH-CHR-CO)_n` is a homopolymer or a copolymer, we can follow these steps:

### Step 1: Understand the Definitions
- **Homopolymer**: A polymer formed from only one type of monomer unit.
- **Copolymers**: Polymers formed from two or more different types of monomer units.

### Step 2: Identify the Monomer
- The given structure `(NH-CHR-CO)_n` suggests a repeating unit. To identify the monomer, we can break it down.
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