Homo habilis, a transition from the-common-ancestor-of-__________-__________-__________ to humans. It's brain is about 50% bigger than a chimp's. The fossils are found with a variety of stone tools; this is the __________ human which we're sure used tools.

Homo habilis, a transition from the-common-ancestor-of-__________-__________-__________ to humans. It's brain is about 50% bigger than a chimp's. The fossils are found with a variety of stone tools; this is the __________ human which we're sure used tools.



Answer: chimps-and-humans, earliest


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