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Tortoise bone F1939
An exoskeleton is an external skeleton common in certain groups of invertebrates. This is in contrast with vertebrates, which are characterized by an internal skeleton. An exoskeloton provides firmness to the body and a certain amount of protection against predators. Examples of animals with exoskeletons are the arthropoda (among others lobsters, insects), molusca (among others snails, ammonites) and echinodermata (among others sea urchins).
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