The Earliest fish appeared over the Cambrian as smaller filter feeders; they ongoing to evolve in the Paleozoic, diversifying into many types. The earliest fish with focused respiratory gills and paired fins, the ostracoderms, experienced major bony plates that served as protecting exoskeletons from invertebrate predators. Sign up for the https://maps.app.goo.gl/kTisAZCbSjAw6nkX8