Final answer:
Endoskeletons in vertebrates like fishes grow with the organism and support larger body structures while providing better leverage and movement. Bone composition offers enhanced protection and flexibility compared to exoskeletons.
Step-by-step explanation:
The advantages of an endoskeleton in vertebrates such as fishes involve several key factors. Unlike exoskeletons, endoskeletons can grow with the organism, allowing for continual growth.
This is crucial because an exoskeleton does not grow with the organism and requires molting which can leave animals vulnerable. Endoskeletons also provide a framework for support that can support larger organisms and gives vertebrates mechanical leverage that allows for more efficient movement on land, unlike exoskeletons which offer less mechanical leverage.
On top of that, the composition of bone in an endoskeleton offers protection to internal organs and forms a mineralized framework within the soft tissue that is more flexible and stronger than the hard encasement that forms an exoskeleton.