Over the course of primate evolution, the improvement and detail that went into creating stone tools gradually increased. This advancement of tools would've required more forethought, which came over the few million years of the tool development. Bipedalism is a significant factor that resulted in the freeing of hands, allowing tool use while walking. The introduction of tools gave primates an advantage as they now had access to better nutritious food sources and a hand in potential self-defence.
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