The Earliest fish appeared in the course of the Cambrian as tiny filter feeders; they continued to evolve throughout the Paleozoic, diversifying into many sorts. The earliest fish with dedicated respiratory gills and paired fins, the ostracoderms, experienced major bony plates that served as protecting exoskeletons in opposition to invertebrate https://maps.app.goo.gl/kTisAZCbSjAw6nkX8