Deep TimeLife & Evolution Jawed fish 420 million years agoNotable Jaws evolve from gill arches, transforming how animals feed. ▲ MattersSaveShareTrace roots Longest chain: The Big Bang → First stars ignite → Supernovae seed heavy elements → The Sun forms → Earth forms → First oceans → First life → Photosynthesis evolves → Great Oxidation Event → Complex cells (eukaryotes) → Multicellular life → First animals → Cambrian Explosion → First vertebrates → Jawed fish Community notesLoading notes… Learn more ranked by votesBookPhilippe JanvierEarly Vertebrates ↗Editor's pickBookNeil ShubinYour Inner Fish ↗Editor's pickVideoSearch on YouTubeevolution of jaws placoderms ↗Editor's pick