Echinoderms (Sand Dollars, Sea Stars, & Cucumbers)

Echinoderms are a group of marine invertebrates that includes  sand dollars, sea stars, and sea cucumbers. Although many are not spiny like the sea urchin, the name echinoderms comes from the Greek for “spiny skin,” Sand Dollars, Sea Urchins, and Sea Stars share a five-part radial symmetry, like a pie cut into five pieces.

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