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

The Dissenter

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Evolution - Evolution of the First Organisms to Animals

The first organisms, and in some ways still the dominant organisms on this planet, are what scientists sometimes call prokaryotic. There's as many bacterial cells in your body as there are human cells. Even on today's Earth, for every kilogram of animals, there's 30 kilograms of bacteria. We like to think that we live in an animal-dominated planet, but that's just because we don't see what's going on.

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