The melody of the ancient earth was quite different, containing more carbon and nitrogen gases than oxygen. The former atmosphere is where much of present day organic molecules such as proteins, lipids, and enzymes were created in abundance. By chance or simply because of the laws of nature, those behavior producing compounds bonded together to create the oldest known life form on earth -- a bacterium. Other life forms evolved from the bacterium through natural selection. These microscopic organisms formed ...If you want to get a full essay, order it on our website: Orderessay
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