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This period included the emergence of life forms around 3.7 to 3.9 billions years ago, the formation of ocean, and the accumulation of oxygen. It is one of the two divisions of the precambrian time extending from 4.6 billion to 542 million years ago.
This period included the emergence of life forms around 3.7 to 3.9 billions years ago, the formation of ocean, and the accumulation of oxygen. It is one of the two divisions of the precambrian time extending from 4.6 billion to 542 million years ago.
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