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Baseline changes in hominin evolution. Much of the changes seen across time in the lineage are small incremental metrical changes, or character shifts. (a) Body mass among hominins [36] over 6 Myr; (b) dental length within A. afarensis over 0.7 Myr [37]; and (c) brain size expansion within the genus Homo since 2.0 Ma (http://www.genetic-inference.co.uk/blog/2010/04/crunching-the-data-on-human-brain-evolution/).
