What best describes an internal skeleton?

What best describes an internal skeleton?

• A. A framework located outside the body made of chitin
• B. A supportive framework located inside the body, typically made of bone or cartilage
• C. A network of nerves
• D. An external shell for protection

Answer: (B)

An internal skeleton is a framework inside the body that provides support for soft tissues and organs and serves as levers for movement. It’s usually made of bone or cartilage, as seen in vertebrates, and in some animals the endoskeleton is built from calcium-containing plates within the body. This inside arrangement differs from an exoskeleton, which sits on the outside (like a shell made of materials such as chitin in insects). It also isn’t about a nerve network or an external protective shell. The inside placement allows the body to grow more easily and provides strong protection for organs while enabling precise movement through joints and muscles.

An internal skeleton is a framework inside the body that provides support for soft tissues and organs and serves as levers for movement. It’s usually made of bone or cartilage, as seen in vertebrates, and in some animals the endoskeleton is built from calcium-containing plates within the body. This inside arrangement differs from an exoskeleton, which sits on the outside (like a shell made of materials such as chitin in insects). It also isn’t about a nerve network or an external protective shell. The inside placement allows the body to grow more easily and provides strong protection for organs while enabling precise movement through joints and muscles.