THE EARTHS ATMOSPHERE CAME FIRST IT WAS FULL OF DANGEROUS GASES

AS THE EARTH BEGAN TO COLL THE WATER VAPOR FORMED THE OCEAN

AS THE OCEAN FORMED IT HELOED FURTHER COOL THE ESRTH DOWN

AS THE OCEAN COOLED TINY MICROSCOPIC ORGANISIMS DEVELOPED

AS THE ORGANISMS FORMED THEY BEGAN TO GIVE OFF OXYGEN AND ADDED IT TO THE ATMOSOHERE