1. Most vertebrates have endoskeletons, which provide support and protection for their internal organs.
2. Insects have exoskeletons, while humans and other mammals have endoskeletons.
3. The endoskeletons of birds are specially adapted for flight, with hollow bones that make them lightweight.
4. Fossilized endoskeletons can provide valuable information about the evolution of different animal species.
5. The endoskeletons of sharks are made of cartilage, which is more flexible than bone.
6. The endoskeletons of turtles are unique because their ribs are fused to their shells.
7. Some animals, like starfish, have endoskeletons made of calcium carbonate plates called ossicles.
8. The endoskeletons of whales are composed of a series of bones that are connected by flexible joints.
9. Scientists study the development of endoskeletons in embryos to better understand how different species have evolved over time.
10. The endoskeletons of humans are made up of bones that provide structure and support for the body.