Pisces Skeleton: Understanding the Internal Structure of Fish

Here's why:

* Endoskeletons are internal skeletons, meaning the bones are located inside the body. This is in contrast to exoskeletons, like those found in insects and crustaceans, which are external hard coverings.

* Fish skeletons are made primarily of bone, although some species (like sharks and rays) have skeletons made of cartilage.

Let me know if you'd like to learn more about the unique features of fish skeletons!