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Parker
Biology
20 January, 05:34
What is an echinoderm with long spines?
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Savanna Michael
20 January, 06:00
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The echinoderm with long spines belongs to the class Echinoidea which includes sea urchins, heart urchins, cake urchins and sand dollars. This spine serves as their protective mechanism from predators. The spines are joined to the skeleton and muscles surround it. The muscles enable them to swivel its spines from predators.
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