* Fish is a very large and diverse group of aquatic vertebrates. It includes many different types, with variations in their anatomy, physiology, and behavior.
* Lampreys are a type of jawless fish, meaning they lack jaws. They are more closely related to hagfish than to sharks.
* Sharks are cartilaginous fish, meaning their skeletons are made of cartilage. They are a different group from bony fish, which include most of the fish you're probably familiar with.
So, a fish is not part of either the lamprey group or the shark group. Instead, lampreys and sharks are both subgroups within the larger group of "fish".