Increased body size in Homo erectus relative to earlier hominids is most likely related to

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Homo erectus had access to larger game animals, which likely provided a higher proportion of protein in their diet compared to earlier hominids. This increase in protein could have contributed to the evolution of their larger body size. Stone-tool use and larger teeth may have facilitated food processing, but these factors alone do not fully explain the increase in body size.

Increased Body Size in Homo Erectus Relative to Earlier Hominids