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Key terms: sea echinoderms stars sea cucumbers sea urchins larvae brittle stars symmetry sea stars regeneration asexual reproduction radial skeleton surfaces feeding bilateral spine tissue tube feet asexual reproduction phylum sand dollar starfish absorb possess actively extinct larval nutrients motile species of sea sea floor symmetric ancestor toxin sessile holothuroidea radial symmetry reproduce takes place these species coelom burrowing bilateral symmetry pigment been observed fossil record hand side circulatory system few species body cavities water column Search external links cited by footnotes on Wikipedia page Echinoderm: |
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