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Fang Chen, a doctor of biology, died in an accident in a laboratory explosion. He returned to the end of the Cambrian period on earth and was reborn as a single-celled organism, a paramecium, with a lifespan of only 5 days. This was nothing. What was even more outrageous than this was that he found several alien-like creatures swimming towards him. ... Eukaryotic animals, coelenterates, Platyhelminthes, linear animals, mollusk, echinoderms, annelids, arthropods, chordates, ... Step by step, when he stood at the top of life, he discovered that the truth of vitality was just a game in the eyes of another world...