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There are many different life forms on earth New species and different sub species are evolving every second as others die out In order to explain the origin of life people have used the bible story of creation while others came up with their own theories Out of all those theories the theory of evolution by Charles Darwin seems to have the most supporting evidence to back it up Evidence on earth suggests that single cell creatures are the ancestors of all life These organisms slowly evolved into air breathing creatures when oxygen was created Slowly the as land dried up these creatures moved away from the water and on to land where they evolved legs and a strong back bone The theory of evolution by Charles Darwin explained how life evolved from survival of the fittest it provides a logical explanation of the evolutionary process these creatures took and how human came to be Evidence on earth shows that single cell organisms eventually evolved to multicelled organisms and complex beings If you look at old fossil records the oldest fossils are all single cell creatures These simple creatures do not require oxygen to live It took in energy from the sun and other energy sources Slowly as oxygen begins to appear on Earth some of the organisms began to evolve lungs to breathe oxygen because When free oxygen entered the picture Breathing is more efficient than drawing energy from the fermentation process that earlier microscope life used Science Biology Pg 36 Other organisms that did not evolve lungs either died out or went down to deeper depths of the ocean Oxygen was first consider a pollutant by microscopic creatures Evolution Pg 36 Because of the free Oxygen those who did not change were killed The evolution through natural selection and survival of the fittest shows that Darwin theory is correct Due to the lack of oxygen within the ocean
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