explain echinodermata
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a phylum of marine invertebrates which includes starfishes, sea urchins, brittlestars, crinoids, and sea cucumbers. They have fivefold radial symmetry, a calcareous skeleton, and tube feet operated by fluid pressure.
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Echinodermata means spiny skin. Member of this marine animal phylum possesses an endoskeleton that surrounds and protects the body. Endoskeleton is made of calcareous plates and spines arranged in mosaic pattern.
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