In episode 71, we treated a galactic cycle of about 220 million years as a unit of time with which to view evolution. Today, we'll be picking up where we left off and seeing the story through all the way to the end- or rather, the beginning...

Sources for this episode:

Cox, B. and Cohen, A. (2013), Wonders of Life. London: HarperCollins Publishers.
Emelyanov, V. V. (2001), Rickettsiaceae, Rickettsia-like Endosymbionts, and the Origin of Mitochondria. Bioscience Reports 21(1): 1-17.
Herron, J. C., and Freeman, S. (2015), Evolutionary Analysis. Harlow: Pearson Education Ltd.
Knoll, A. H. (2005), Life on a Young Planet: The First Three Billion Years of Evolution on Earth. Princeton: Princeton University Press.
Thain, M. and Hickman, M. (2004), The Penguin Dictionary of Biology (11th edition). London: the Penguin Group.
Wernegreen, J. J. (2012), Endosymbiosis. Current Biology 22(14): R555-R561.

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