What are pseudocoelomates? Give one example.

Explanation

**Step-by-Step Solution:**

1. **Definition of Coelom**:
- A coelom is a fluid-filled body cavity that is completely lined by mesoderm tissue. It provides space for the development and movement of internal organs.

2. **Types of Body Cavities**:
- Organisms can be classified based on the presence or absence of a coelom:
- **Coelomates**: Organisms that have a true coelom, which is fully lined by mesoderm.
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