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Key terms: arms crinoid stalk fossil echinoderms sea surface living stem species tube feet calyx mouth nerves upper forms feather body symmetry feeding other echinoderms attached tissue bottom nervous biology ordovician larva connected branches paleozoic bahama smaller radiation ossicles sea water itself intestine extinction divided oesophagus mass numerous molecules food adult somewhat marine nervous system substrate inside carmel Search external links cited by footnotes on Wikipedia page Crinoid: |
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