The Earliest fish appeared in the course of the Cambrian as smaller filter feeders; they ongoing to evolve in the Paleozoic, diversifying into quite a few varieties. The earliest fish with devoted respiratory gills and paired fins, the ostracoderms, experienced large bony plates that served as protective exoskeletons towards invertebrate https://maps.app.goo.gl/kTisAZCbSjAw6nkX8