Time's Oldest Debate According to recent studies, planet earth formed approximately four and a half billion years ago. Since then, the earth has undergone many evolutionary changes. Earth began as a swirling gas which condensed to create an immense land mass. The ancient earth was basically the same as today's earth except for the environment. The atmosphere 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 life 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. ....

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