Evolution Evolution is the complex process by which living organisms originated on earth, and have been changed and modified through changes in form and function. The earliest known fossil organisms are single-celled forms that are kind of similar to modern bacteria, which date back from about 3.4 billion years ago. Evolution has resulted in new types of organisms, many of which have become extinct, but some that have developed into the normal everyday plants and animals …showed first 75 words of 1508 total…

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