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05-11-2017
Biology

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Among the many remarkable aspects of the origin and history of life on earth is that life originated as much as ____________ years ago.

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06-11-2017

The oldest fossil evidence that geochemists have been able to find in deposits in Pilbara, Australia, and South Africa have been dated to 3.5 bya. In addition, organic compounds that may be the result of those produced by organisms have been dated, also in Greenland, to 3.8 bya.

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