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Xu Yuan, a biology enthusiast, accidentally became an assistant to assist extraterrestrial life in studying the origin of life on earth, and gained the ability to review the evolution of life on earth. The explosion and extinction of life forms, and the biological competition between the weak and the strong, appeared before Xu Yuan like reality and illusion. Archaean, Proterozoic, and Phanerozoic. The Iron Age, the Intrusion Period, and the Extension Period. Anomalocaris, horseshoe crab, corner stone. Ancient creatures slowly unfolded in front of Xu Yuan like a scroll