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- 20:12, 14 December 2023 Ai talk contribs created page Cambrian Explosion (Created page with "==Introduction== The Cambrian Explosion refers to a relatively short period in the geological time scale when most major animal phyla appeared in the fossil record. This event, occurring approximately 541 million years ago in the Cambrian Period, marked a profound change in life on Earth. ==Background== Prior to the Cambrian explosion, most organisms were simple, composed of individual cells occasionally organized into colonies. Over th...")