Identify the main periods of mass extinction. Click on 2 answer choices.
A. Permian
B. Cenozoic
Cretaceous
D. Mesozoic
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According to the study by Moore, what causes gang activity？
A. Cliques that form. in high school
B. Normal feelings of insecurity in teens
C. Abusive family members in the home
D. Loyalty to family already in the gang
Why do the master carvers work on the bottom figures？
A. Master carvers are usually too old to work at the top of the pole.
B. The figures near the bottom are more visible to the public.
C. The totem pole is too large for just one carver to complete.
D. The last carving is an honor reserved for the masters.
Users can chat on net anywhere because of______.
A. a social and commercial environment
B. high speed networking and computing
C. three rapidly evolving technologies
D. simultaneous use of voice, video, image and data
It can be inferred from the first paragraph that？？？______.
American auto plants have lower efficiency because they often have fewer workers
B. American auto plants cannot improve their efficiency by hiring Japanese workers
C. Japanese auto makers achieve higher productivity because of their unique culture
D. Japanese auto makers will see a lower efficiency if they hire American workers
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