Proterozoic era (the formal name for the time interval of 2.5 to 0.5 billion years ago) to Lynn Mar- gulis and Dorion Sagan, in their 1986 book :
CITATION STYLE
Ward, P. D., & Brownlee, D. (2000). How to Build Animals. In Rare Earth (pp. 83–112). Springer New York. https://doi.org/10.1007/0-387-21848-3_5
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