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