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#733 Andrew Knoll - A Brief History of Earth: Four Billion Years in Eight Chapters

The Dissenter

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What Is the Best Estimation of When Life First Appeared?

We have no rocks of any type that are older than four billion years. So what we can really say is the first time that geology gives us a peak at the past, life is already there. It's very clear that three and a half billion years ago, there was a biological carbon cycle,. There were intermediates, some more chemical, some looking more biological.

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