The sea urchin uses its spines for protection, locomotion, and to transport plant material to its mouth which is located on the underside of its body. ... Like a starfish, the sea urchin has pinching organs between its spines, and tube feet which it uses to move and attach itself to the substrate.
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The sea urchin uses its spines for protection, locomotion, and to transport plant material to its mouth which is located on the underside of its body. ... Like a starfish, the sea urchin has pinching organs between its spines, and tube feet which it uses to move and attach itself to the substrate.