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| External skeleton made of protein and a special substance called chitin. |
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| Made of many identical light-sensitice cells. |
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| Fellers that respond to touch, taste, and smell. |
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| Both a head and a thorax and usually 4 pairs of walking legs. |
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| Simple heart pumps blood through blood vessels that empty into spaces in the animal's body called sinuses. |
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| Heart circulates blook through a network of blood vessels that form a closed loop. |
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| Circle of nerve fibers around the mouth. |
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| Runs from nerve ring to tip of each arm and control the movements of the sea star's arms. |
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| Uses water pumps to help animal move, eat, breathe, and sense its environment. |
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