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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.
by Fraser Cain on September 30, 2013. Life has existed on Earth for billions of years, appearing shortly after the planet had cooled and liquid water became available. From the first bacteria to the amazingly complex animals we see today, life has colonized every corner of our planet.