| The evolution of life began with the big basng. Four point six billion years ago the Earths solar system formed. Four point four billion years ago the ocaens formed. Three hundred million years later replicating molecules emerged. Oxygen began to form about two billion years ago, cells with nuclei appeared about one point five billion years ago. Then a protective ozone layer was formed. The dinosaurs then ruled the Earth for one hundred and sixty million years. Their decline opened the way for primitive animals. Only in the last 0.01% of Earth time did our own speicies emerge. The worlds civilizations developed in the last 1% of human existance(4500 years), followin gthe domestication of species and key technical advances. Human technology then propelled on industrial revolution and now learned to harness the power of the atom, crack the genetic code, and broken into space. |
