List two peculiar characters of Phylum Echinodermata.

Explanation

### Step-by-Step Text Solution:

1. **Identify the Phylum**: The question asks for peculiar characters of Phylum Echinodermata. This phylum includes marine animals such as starfish and sea urchins.

2. **Character 1 - Body Structure**: One peculiar character of Echinodermata is that their body is covered with spiny skin. This spiny texture is a distinctive feature that helps in protection against predators.

3. **Character 2 - Symmetry**: Another peculiar character is that adult echinoderms exhibit radial symmetry, while their larvae show bilateral symmetry. Radial symmetry means that the body can be divided into similar halves around a central axis, unlike bilateral symmetry, which can only be divided into two equal halves along one plane.

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