Animals without coelom are known as ……….

Explanation

**Step-by-Step Solution:**

1. **Understanding Coelom**: Coelom is defined as the body cavity that forms from the mesoderm during embryonic development in more complex animals. It serves multiple functions, including acting as a shock absorber and allowing for the movement and protection of internal organs.

2. **Classification Based on Coelom**: Animals can be classified based on the presence or absence of a coelom into three categories:
- **Coelomates**: Animals that possess a true coelom.
- **Pseudocoelomates**: Animals that have a body cavity that is not a true coelom.
- **Acoelomates**: Animals that do not have a coelom at all.
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