The Earliest fish appeared throughout the Cambrian as modest filter feeders; they continued to evolve with the Paleozoic, diversifying into many forms. The earliest fish with focused respiratory gills and paired fins, the ostracoderms, had heavy bony plates that served as protective exoskeletons towards invertebrate predators. is really a member https://maps.app.goo.gl/kTisAZCbSjAw6nkX8