In biology, the skeleton or skeletal system is a strong framework that supports the body. External rigid frameworks, such as those found in some invertebrates (for example insects), are termed exoskeletons. Internal rigid frameworks, such as those found in most vertebrates (for example mammals), are termed endoskeletons. The average adult human skeleton comprises 206 bones These bones meet at joints, the majority of which are freely movable, making the skeleton flexible and mobile. The skeleton… (More on Skeletal)