The earths history is sometimes divided into two eons, Cryptozoic (hidden life) and Phanerozoic (visible life), with
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The earth’s history is sometimes divided into two eons, Cryptozoic (“hidden life”) and Phanerozoic (“visible life”), with the first corresponding to Precambrian time and the second extending from the beginning of the Paleozoic Era to the present day. What do you think is the reason for this division?
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