The given below are the names of phyla and names of three animals. Underline the two animals which belong to each
Echinodermata: Cucumeria, Mytilus, Antedon

Explanation

To solve the question, we need to identify which of the three animals listed belong to the phylum Echinodermata. The animals given are Cucumeria, Mytilus, and Antedon.

### Step-by-Step Solution:

1. **Identify the Phylum**: The question specifies the phylum Echinodermata. This phylum includes marine animals characterized by a water vascular system and often have a radial symmetry.

2. **Analyze Each Animal**:
- **Cucumeria**: This is commonly known as sea cucumber. Sea cucumbers are indeed members of the phylum Echinodermata. They lack arms and have a soft body.
...