Finally, there is growing evidence that the evolution of the genus Homo proceeded in a mosaic pattern: in other words, these characteristics did not appear all at once in a single species rather, they were patchily distributed in different species from different regions and time periods. Second, early Homo fossils appear quite variable in brain size, facial features, and teeth and body size, and there is not yet consensus about how to best make sense of this diversity. First, many fossil specimens dating to this time period are incomplete and poorly preserved, making them difficult to evaluate. While these criteria seem relatively clear-cut, evaluating them in the fossil record has proved more difficult, particularly for the earliest members of the genus. There is also an apparent decline in sexual dimorphism (body-size differences between males and females). Some researchers would include larger overall body size and limb proportions (longer legs/shorter arms) in this list.
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