Name a copolymer which is used for making non-breakable plastic crockery.

Explanation

### Step-by-Step Solution:

1. **Identify the Requirement**: The question asks for a copolymer used in making non-breakable plastic crockery.

2. **Recall Relevant Copolymers**: One well-known copolymer used for this purpose is urea-formaldehyde resin.

3. **Define the Monomers**: The monomers involved in the formation of urea-formaldehyde resin are:
- Urea (NH₂CONH₂)
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