What is the internal skeleton found in all vertebrates called?

The internal skeleton found in all vertebrates is called an endoskeleton. This structure serves as a framework for the body, providing support and protection for internal organs. Unlike an exoskeleton, which is an external shell found in some invertebrates (such as insects and crustaceans), the endoskeleton is located within the body. It is composed of bones and cartilage, allowing for growth and flexibility.

Vertebrates, including mammals, birds, reptiles, amphibians, and fish, rely on their endoskeletons to maintain their shape and facilitate movement by providing attachment points for muscles. The endoskeleton is also critical for the production of blood cells and the storage of minerals such as calcium and phosphorus. Therefore, the endoskeleton plays a vital role in the health and functioning of vertebrates throughout their lives.