Thoeries of Evolution         Evolution is the process by which living organisms originated on earth and have changed their forms to adapt to the changing environment. The earliest known fossil organisms are the single-celled forms resembling modern bacteria; they date from about 3.4 billion years ago. Evolution has resulted in successive radiations of new types of organisms, many of which have become extinct, but some of which have developed into the present fauna and flora of the …showed first 75 words of 1795 total…

…showed last 75 words of 1795 total…human species(Microsoft96). Works Cited Ardrey, Robert. The Hunting Hypothesis: A Personal Conclusion         Concerning the Evolutionary Nature of Man. New York:         Antheneum, 1976. Encarta 96. Computer Software. Microsoft, 1995. Gribbon, John and Cherfas, Jeremy. The Monkey Puzzle: Reshaping the         Evolutionary Tree. Philly: Pantheon, 1982. Reader, John. Missing links: The Hunt for Earliest Man. Boston: Little,         1981 Schwartz, Jeffery H. The Red Ape: Orang-Utans and Human Origins.         San Francisco: Houghton, 1987. Wilson, Peter J. The Domestication of the Human Species. Oxford:         Yale, 1991.