The Earliest fish appeared through the Cambrian as modest filter feeders; they continued to evolve from the Paleozoic, diversifying into quite a few varieties. The earliest fish with devoted respiratory gills and paired fins, the ostracoderms, experienced significant bony plates that served as protecting exoskeletons from invertebrate predators. is applied https://maps.app.goo.gl/kTisAZCbSjAw6nkX8