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Crinoidea (examples (comatulida, sea urchins, sand dollar), general body…
Crinoidea
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special adaptations
tube feet
small, muscular, fluid-filled tubes that end in suction-cuplike structure and are used in movement.
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Ampulla
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When muscles contrast the ampulla, water is forced into the tube, it will extend.
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By: Jana, Lana, Moody, Shahad
