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Sand dollars a rigid skeleton called a 'test' (which is basically a shell).

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11y ago
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13y ago

Sand dollars do not have brains. They are invertebrates whose bottom surface contains the mouth, black spines and cilia.

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10y ago

The sand dollar has one thick calciferous bone like structure called the test.

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12y ago

No

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12y ago

nope

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10y ago

Yes

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Q: Do sand dollars have backbones
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