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noun. shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells
He saw asea urchinin the water.
He saw a sea urchin in the water.
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What weapon does a sea urchin have?
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What does the black sea urchin get from its partner, the coral-reef crab?
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echinoderm; marine invertebrates; shallow-water echinoderm
bird
1 syllables
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