The melody of the ancient earth was quite different, containing more carbon and nitrogen gases th an oxygen. The former ambiance 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 mien producing compounds bonded together to create the oldest known life form on earth -- a bacterium. Other life forms evolved from the bacterium by natural selection. These microscopic organisms formed ...If you want to get a full essay, order it on our website: OrderCustomPaper.com
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