HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Calcium carbonate use in animals. Assortment of aquatic invertebrates that use calcium carbonate to produce skeletal and protective structures. These include the shells of molluscs such as clams and snails, the exoskeletons of crustaceans such as crabs (upper right), and the endoskeletons of echinoderms such as starfish (lower left) and urchins (lower right).
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