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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.
How Did Life First Appear. The fact that life began on earth is just a natural consequence of the known fundamental laws of chemistry and physics. Life was inevitable, once certain conditions prevailed.ow Did Life First Appear. The fact that life began on earth is just a natural consequence of the known fundamental laws of chemistry and physics. Life was inevitable, once certain conditions prevailed.