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Evolution a process of change through time is what links together the enormous diversity of the living world A lot of evidence is present that indicates that the earth has had a very long history and that all living things arose in the course of that history from earlier more simpler forms In other words all species have descended from other species and all living things share common ancestors in the past Basically organisms are what they are because of their history Today there are many theories and possibilities related to evolution which contribute to our understanding of the process Our planet was born 46 billion years ago as a great cloud of dust and gas condensed into a sphere As gravity pulled this great cloud tightly together heat from great pressure and radioactivity melted the planets interior and most of its mass For millions of years after this strong volcanic activity all over the planet shook the earths crust At the same time the earth was showered by a very strong meteor shower From studying volcanoes it is known that eruptions pour out carbon dioxide nitrogen and other gases It is also known that meteorites carry water in the form of ice and many carbon containing compounds That might suggest that the combination of volcanic activity and a constant shower of meteorites released the gases that created the Earths atmosphere Geologists believe that the earths early atmosphere contained water vapor carbon monoxide carbon dioxide hydrogen and nitrogen It also may have contained ammonia and methane It did not contain oxygen which is the main reason why the Earth could not have supported life As for oceans they couldnt have existed at first because the Earths surface was extremely hot But about 38 billion years ago the Earths surface cooled enough for water to remain a liquid on the ground Thunderstorms wet the planet for many years and oceans began to fill This is known
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