The best estimate for the date of the Last Universal Common Ancestor (LUCA) of all life is given as

Name: The best estimate for the date of the Last Universal Common Ancestor (LUCA) of all life is given as
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The best estimate for the date of the Last Universal Common Ancestor (LUCA) of all life is approximately 4 billion years ago (byr ago). This estimate is based on molecular clock analyses and the fossil record, suggesting that life began on Earth not long after the planet's formation.

The Best Estimate for the Date of the Last Universal