Which term describes an internal skeleton located inside the body?

Which term describes an internal skeleton located inside the body?

• A. Endoskeleton
• B. Exoskeleton
• C. Mouth
• D. Head

Answer: (A)

Internal skeletons are endoskeletons—the framework inside the body that supports and protects other tissues and organs. This internal support system contrasts with an exoskeleton, which sits on the outside of the body, like shells on some insects and crustaceans. An endoskeleton, made of bone or cartilage, enables movement and shields internal organs from within. The other options—mouth and head—are body parts, not skeleton types, so they don’t describe the internal framework that supports the body.

Internal skeletons are endoskeletons—the framework inside the body that supports and protects other tissues and organs. This internal support system contrasts with an exoskeleton, which sits on the outside of the body, like shells on some insects and crustaceans. An endoskeleton, made of bone or cartilage, enables movement and shields internal organs from within. The other options—mouth and head—are body parts, not skeleton types, so they don’t describe the internal framework that supports the body.