The evolution in bone in fishes to the evolution of vertebrates include ; the fish uses the bone for flexibility and the vertebrates are for solely the reason for structural support
the fish that do have jaws can easily break ther food down into chunks and easily swallow it and one without jaws can do that
so they can eat.
Gill supports
Sail backed reptiles predate the dinosaurs. Before them, terrestrial vertebrates were a variety of Permian amphibians. Before those vertebrate animals were all fishes, both with jaws and more primitive fishes without jaws.
The evolution of jaws is believed to be used originally for respiratory purposes. However, it is important to the history of vertebrates mainly because it allowed for more efficient eating.
The phylum Chordata has jaws and skulls that are important in their evolution. These features allowed for more efficient feeding and protection, leading to the diversification and success of this phylum in various environments.
if we have no ocenographers , the ocean will not safe and we will not know how fishes live.And we do not know if the fishes that we cought is poisonous or safe to eat.
They're both extinct bony fishes. The difference is that ostracoderms were jaw-less and placoderms had jaws.
Evolution of paired limbs was one of major developments . Similarly development of jaws , Amnion etc are also major developments .
It is the theory that paired fins arose in jawed fishes from the evolution of ventrolateral skin folds in jawless, basal fishes. The folds then separated and specialized to form the paired pectoral and pelvic fins in more evolved fishes.
It increases the nubmer of fishes, this you are able to catch more fish and sell them for more profit, and if the nubmer of fishes is decreased, then numbers caught will as well.
Its an adaptation created over time in order to help them maneuver through their environment. Evolution to be frank.