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lthough some forms of australopithecines could have been capable of tool use, definitive evidence of tool use does not appear in the fossil record until ______ million years ago. 2.5 Which of the following is a possible candidate for the earliest hominin? Sahelanthropus tchadensis What environmental condition made the Afar region so conducive to fossilization? A river used to flow there, which resulted in layers of sedimentation covering skeletons. Compared to a quadruped's foot, a biped's foot has all of the following except __________. a fusion between the first and second metatarsal Early hominins lost their ___________, which resulted in a more rounded braincase. sagittal and compound temporonuchal cranial crests The LH4 mandible from Laetoli, Tanzania, is a type specimen for Australopithecus afarensis. What does the term type specimen refer to? the original anatomical reference specimen for the species The early Pliocene, which is the era of greatest hominin diversification, is marked by major ______________. climatic fluctuations What does the turnover-pulse hypothesis state? Cyclic changes in climate resulted in extinctions and changes in species variability and abundance. The first appearance of the genus Homo around ______ million years ago coincided with large-scale climatic alterations. 2.9

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