Which types of animals are grouped in class Tremotoda and Cestoda?

Explanation

### Step-by-Step Solution:

1. **Identify the Phylum**: Both Trematoda and Cestoda belong to the phylum Platyhelminthes, which is known for flatworms.

2. **Classify the Types**: Within the phylum Platyhelminthes, there are three main classes: Turbellaria, Trematoda, and Cestoda.

3. **Differentiate Between Classes**:
- **Trematoda**: This class consists of parasitic flatworms known as flukes. They possess hooks and suckers that allow them to attach to their host's body. An example of a Trematoda is the liver fluke, which can cause diseases in the host's intestines.
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