Which group of animals are named because of their spiny skin and have a peculiar water-driven tube system that they use for moving around?

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**Solution:**

1. The group of animals called **Echinodermata** includes starfish, sea urchins, and sea cucumbers.

2. The name "Echinodermata" is derived from Greek words: *echinos* meaning **spiny** and *derma* meaning **skin**, indicating their characteristic spiny skin.

3. Echinoderms possess a unique **water vascular system**, a network of fluid-filled canals used for locomotion, feeding, and respiration.

4. This system operates through hydraulic pressure to extend or retract tube feet, enabling movement.

5. Other groups listed (Hemichordata, Aschelminthes, Mollusca) do not have this combination of spiny skin and water vascular system.

**Answer:** Echinodermata

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