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

The Dissenter

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The Building Blocks of Life on Earth

Do you think there's good evidence that all the building blocks of life could have developed on Earth, or at least some would have been brought to Earth from some extraterrestrial source? "There's no reason to doubt that all of the major things that give rise to the chemistry of ourselves could have and very likely did originate in terrestrial environments" The last common ancestor of life as we know it already had both RNA and metabolism.

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