Diversity of oldest fossils could mean extraterrestrial life is more likely.
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References
AllwoodA. C., WalterM. R., KamberB. S., MarshallC. P.& BurchI. W. Nature, 441. 714 - 718 (2006).
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Macquarie University, Sydney
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Hopkin, M. Complex ecosystems arrived early. Nature (2006). https://doi.org/10.1038/news060605-7
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DOI: https://doi.org/10.1038/news060605-7