Timeline of life on Earth

~530 Mya Cambrian explosion - A sudden increase in organism complexity - All of the modern body types evolve in a sudden burst of evolution Annelids (worms) Arthropods (insects, crustaceans) Mollusks (snails, clams, squid) Chordates (precursors to vertebrates)
~430 Mya Fishes evolve
~350 Mya Amphibians
~300 Mya Reptiles, Mammal like reptiles
~230 Mya Dinosaurs
~200 Mya Mammals
~150 Mya Birds

~530 Mya Cambrian explosion - A sudden increase in organism complexity - All of the modern body types evolve in a sudden burst of evolution Annelids (worms) Arthropods (insects, crustaceans) Mollusks (snails, clams, squid) Chordates (precursors to vertebrates)