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The top documents tagged [species sea urchins]
PHYLUM ECHINODERMATA. Characteristics: Endoskeleton Calcareous (calcium carbonate) Ossicles arise from mesodermal tissue Pentaradial symmetry as adults
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Phylum Echinodermata Kingdom Animalia. General Characteristics Name means “ spiny skin ” 1.Exclusively marine 2.Possess a semi-flexible endoskeleton
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