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Panspermia Explains the Complexity of Life on Earth
There's some graphs that show sort of the level of genetic information in various kinds of life on the history of Earth. And basically, we are now more complex than the earlier life, but the earlier life was still pretty damn complicated. So panspermia allows you to explain that complexity by saying, well, it's been another 5 billion years on another planet going through lots of earlier stages where it was working its way up and then at the beginning of Earth.