What is the difference between an endoskeleton and a exoskeleton? What types of animals have each?

An endoskeleton is formed on the inside of an animal's body, while an exoskeleton is formed on the outside of an animal's body. An endoskeleton is often made of cartilage and bone, while an exoskeleton is often made of chitin and proteins, or calcium carbonate.Animals that have these Tortoises Mammals, reptiles, birds, fish Insects, spiders and shellfish.

Explanation:

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An endoskeleton develops on the inside of an animal's body, whereas an exoskeleton develops on the outside. An endoskeleton is typically composed of cartilage and bone, whereas an exoskeleton is typically composed of chitin and proteins, or calcium carbonate.

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