About 2 million years ago - two groups developed: the australopithecines - generally smaller brained and not users of tools; and the line that led to genus _________ - larger brained and makers and users of tools.

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1. About 2 million years ago - two groups developed: the australopithecines - generally smaller brained and not users of tools; and the line that led to genus _________ - larger brained and makers and users of tools.