When did the first fish appear?
The pikaia changed into observed with the aid of using fish with out jaws, so their mouths had to stay open to capture flora and animals as they swam with the aid of using. Then, approximately 475 million years ago, the coelacanth evolved jaws and teeth. Since they could consume greater effectively, those fish with jaws grew faster. Amazingly, coelacanths are still round today!
