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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.
What is the first living life form on earth? The first forms of life on Earth were most likely very similar to bacteria or other prokaryotic organisms. What organism provides the earliest evidence for the life on Earth?   The oldest organism ever to appear on the face of the Earth, was probably the Cyanobacteria.