Vertebrates are animals that have backbones and an endoskeleton. In contrast, invertebrates are animals that do not have backbones. Invertebrates can have a skeleton outside their bodies called an exoskeleton, while some invertebrates have no skeleton at all
Some animals, such as the tortoise and turtle (shell page), have both an endoskeleton and an exoskeleton.
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Vertebrates are animals that have backbones and an endoskeleton. In contrast, invertebrates are animals that do not have backbones. Invertebrates can have a skeleton outside their bodies called an exoskeleton, while some invertebrates have no skeleton at all
Some animals, such as the tortoise and turtle (shell page), have both an endoskeleton and an exoskeleton.