sentences:  "P. boisei" was known for massive facial and dental bones and structure, primarily larger mandibles, molars, and premolars, which was an adaptation allowing them to consume hard plant foods with the ability of high force chewing.The first species in the genus "Homo", "Homo habilis", has been found in Tanzania and Kenya at sites dating between 2.1 and 1.5 million years ago.Species within the genus "Homo" showed no difference within molar size up until "Homo floresiensis", where smaller molars were beginning to be expressed.