Sand dollars might look like simple shells, but they’re actually living animals related to sea urchins and starfish. These flat, round creatures spend most of their lives buried just beneath the sand on the ocean floor. When they’re alive, sand dollars are covered in tiny purple or brown spines that help them move slowly through the sand and collect microscopic food particles like algae and plankton. The beautiful white “shells” people often find on the beach are actually the skeletons of sand d
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