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What was the first eon of the Precambrian?A. PaleozoicB. HadeanC. PhanerozoicD. Archean
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What was the first eon of the Precambrian?A. PaleozoicB. HadeanC. PhanerozoicD. Archean

User RSK
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Hadean is the first eon of precambrian, and took place around 4.6 and 4.0 billion years ago.

User Martin Lie
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