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From fossil evidence, it appears that life may have existed on Earth as early as 3.5 billion years ago. This suggests that life must have evolved sometime during Earth's tumultuous first billion years.
Hence it is the first plant as well as first animal. Some millions of year back. The first known fossils of what is possibly animal life appear in the Ediacara biota just prior to the Cambrian era.ence it is the first plant as well as first animal. Some millions of year back. The first known fossils of what is possibly animal life appear in the Ediacara biota just prior to the Cambrian era.