Final answer:
Crustaceans have exoskeletons that provide protection and support for the animals, which are reinforced with calcium carbonate to enhance strength.
Explanation:
Crustaceans, such as crabs and lobsters, typically have an exoskeleton that is shed through molting as they grow. This external hard covering provides protection and support for these animals. In addition, the exoskeletons of many crustaceans are reinforced with calcium carbonate, making them even stronger.
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