A) No one had worked there before, so anything they found would make them and their work famous.
B) Several skeletons of early hominins had been found there already, so they knew it was a good place to work.
C) The layers exposed by the gorge were known to include ancient stone tools and animal remains.
D) The environment around Olduvai is very wet and forested, and the Leakeys knew that early primates had evolved in a well-watered habitat.
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A) dental gap.
B) gingival space.
C) mesial bridge.
D) diastema.
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A) speech and advanced cognition.
B) bipedal locomotion and nonhoning chewing.
C) bipedal locomotion and speech.
D) nonhoning chewing and advanced cognition.
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A) Ardipithecus is at or near the base, and Australopithecus garhi gave rise to early Homo.
B) robust australopithecines such as Australopithecus boisei are at the base and more gracile forms such as Australopithcus africanus evolved from those early robust forms.
C) Australopithecus anamensis evolved directly into early Homo.
D) all of the different so-called species of Australopithecus are really one species, with the robust forms being males and the more gracile forms being females.
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A) hand axes, flakes, and cores.
B) cobbles, flakes, and side scrapers.
C) choppers, cobbles, flakes, and bone tools.
D) choppers, hand axes, and side scrapers.
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A) eating hard food with sand in it.
B) eating a great deal of red meat.
C) eating foods requiring heavy chewing.
D) gnawing on bones.
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A) premolars and molars
B) temporalis muscles and a sagittal crest
C) front teeth and small back teeth
D) premolars, molars, temporalis muscles, and a sagittal crest
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A) do not define a hominin.
B) define a hominin.
C) define a higher primate.
D) did not evolve through the primate lineage.
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A) rounded heel.
B) nondivergent big toe.
C) double arch.
D) rounded heel, nondivergent big toe, and double arch.
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A) hunting.
B) tool use.
C) bipedalism.
D) speech.
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A) bipedalism
B) loss of diastema
C) increased brain size
D) changes in the hand that allow toolmaking and use
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A) opposable thumb
B) permanently bent knee
C) convergent eyes
D) shape of the pelvis and spine
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A) nonhoning dentition, primitive apelike traits, and increased brain size
B) modified honing dentition, primitive apelike traits, and increased brain size
C) modified honing dentition, primitive apelike traits, and small brain size
D) nonhoning dentition, loss of apelike traits, and small brain size
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A) locomotion.
B) social patterns.
C) body sizes.
D) diets.
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A) femur (thighbone)
B) skull
C) foot
D) pelvis
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A) Upper Paleolithic.
B) Lower Paleolithic.
C) Eocene.
D) Solutrean.
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A) biting.
B) crushing.
C) shearing.
D) mashing.
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