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................ is a unique system fou...

................ is a unique system found in echinoderms.

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**Step-by-Step Text Solution:** 1. **Identify the Subject**: The question asks for a unique system found in echinoderms. Echinoderms are a group of marine animals that include starfish, sea urchins, and sea cucumbers. 2. **Define Echinoderms**: The term "echinoderm" comes from Greek roots meaning "spiny skin." These organisms are characterized by their radial symmetry and a calcareous endoskeleton. 3. **Unique System in Echinoderms**: The unique system found in echinoderms is known as the **water vascular system**. This system is crucial for their movement, feeding, and respiration. 4. **Components of the Water Vascular System**: The water vascular system comprises several key structures: - **Central Ring Canal**: This is the main canal that encircles the mouth of the echinoderm. - **Radial Canals**: These extend from the central ring canal along each arm of the echinoderm. 5. **Function of the Water Vascular System**: The water vascular system functions by circulating water through the canals, which helps in: - **Locomotion**: By controlling the tube feet, echinoderms can move. - **Gas Exchange**: It aids in the exchange of gases. - **Nutrient Transport**: It helps in the distribution of nutrients throughout the body. 6. **Conclusion**: Therefore, the answer to the question is that the **water vascular system** is a unique system found in echinoderms. ---
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