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The Cellular Origin of Vertebrates
[chapter]
2012
Evolutionary Biology, Cell-Cell Communication, and Complex Disease
Preserved Fulltext
Life has existed on Earth for billions of years, starting with primitive cells that evolved into unicellular organisms ( Fig. 1.1 ) over the course of the fi rst 4.5 billion years of Earth ' s existence. The evolution of complex biologic organisms began with the symbiotic relationship between prokaryotes and eukaryotes. This relationship gave rise to mitochondria, and the resulting diversity of unicellular
doi:10.1002/9781118130452.ch1
fatcat:fxcpvih7afggjhutas4xestsye