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Evolutionary biology
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Darwin's finches by John Gould
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Evolution of cells refers to the evolutionary origin and subsequent evolutionary development of cells. Cells first emerged at least 3.8 billion years ago^[1]^[2]^[3] approximately 750 million years after Earth was formed.^[4]

^ Schopf, JW, Kudryavtsev, AB, Czaja, AD, and Tripathi, AB. (2007). Evidence of Archean life: Stromatolites and microfossils. Precambrian Research 158:141-155.
^ Schopf, JW (2006). Fossil evidence of Archaean life. Philos Trans R Soc Lond B Biol Sci 29;361(1470):869-85.
^ Raven PH, Johnson GB (2002). Biology. McGraw-Hill Education. p. 68. ISBN 978-0-07-112261-0. Retrieved 7 July 2013.
^ Cooper GM (2000). "The Origin and Evolution of Cells". The Cell: A Molecular Approach (2nd ed.).