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The structural deference between them is that Sea urchins are more globular whereas sand dollars are flattened.

Unlike sea urchins, the sand dollars burrow themselves when threatened.

Sand dollars have anus opening at their back side whereas the sea urchins have it at the top.

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10y ago
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11y ago

they both have spines but the sea urchin is round while the sand dollar is flat

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Q: What is the difference between sand dollars and sea urchins?
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