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A. Housing for immigrants from the countryside.
B. Inadequate sanitation services for the population.
C. Reconstruction of cities devastated by war.
D. The growth of sprawling suburban areas.

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A. She wants the students to spend more time reading their books.
B. She did not have time to talk about the concept in depth.
C. She is going to read some important information to the students.
D. She wants the students to prepare for the next class.

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A. fossilized shellfish.
B. An animal skull.
C. A dead tree.
D. A giant crystal.

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A. Popcorn.
B. Radiometric dating.
Carbon-14.
D. Geological formations.

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A. The average time it takes for half of a group to decay.
B. Half the time it takes for a group to decay.
C. Half an hour for an individual nucleus to decay.
D. Half of the carbon present in a living organism.

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A. Housing for immigrants from the countryside. B. Inadequate sanitation services for the population. C. Reconstruction of cities devastated by war. D. The growth of sprawling suburban areas.

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A. Housing for immigrants from the countryside.
B. Inadequate sanitation services for the population.
C. Reconstruction of cities devastated by war.
D. The growth of sprawling suburban areas.