Sand dollars typically live in the intertidal zone. Which adaptation do sand dollars most likely have?

The intertidal zone is covered by water at high tide and exposed to air at low tide. Sand dollars are marine animals, so they are adapted to salt water, not fresh water, and they do not breathe air with lungs. An adaptation that helps them avoid drying out when exposed is most useful, making “a body structure that allows them not to dry out when out of the water” the best answer.

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