The Earliest fish appeared in the Cambrian as little filter feeders; they ongoing to evolve in the Paleozoic, diversifying into lots of kinds. The earliest fish with focused respiratory gills and paired fins, the ostracoderms, experienced hefty bony plates that served as protective exoskeletons versus invertebrate predators. Опорно-двигательная система рыб https://maps.app.goo.gl/kTisAZCbSjAw6nkX8