As Craig mentioned, it was a common ancestor. When you look at timeline pictures for comparison (I like pictures) you can see how the skull changed shape, how we use two legs to walk on rather than all-fours, shape of teeth and environment they live in. Here is a link with a nice picture (just over half way down the page): http://www.nature.com/scitable/knowledge/library/overview-of-hominin-evolution-89010983
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