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#sea urchin #echinoid #spiny skin #echinoderm

🖐️🌵🌊

#echinoderm #marine invertebrate #spiny skin #radial symmetry #pentaradial

🛡🪨

#spiny skin #echinodermata meaning #marine invertebrate #spines #water vascular system

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#echinoderm #radial symmetry #spiny skin #marine invertebrate #sea floor #benthic