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Key terms: sea urchin spines echinoids period echinoidea fossils feeding species lantern aristotle tube feet stars spiny serve genes symmetry echinoderms www triassic humans cretaceous period visible sharp brittle adhesive cm jurassic paleozoic s lantern irregular echinoids specimens biology shell roe anatomy survived sand evolved teeth upper part Search external links cited by footnotes on Wikipedia page Sea urchin: |
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