Answer each of the following questions using complete sentences. Remember the "5 Ws and How" (who, what,
why, where, when, how).
1) How have medical, scientific, and technological advances contributed to an increase in average life
expectancy?

2) Compare and contrast modern global migrations and earlier migrations to the United States (circa 1870-1920).

3) How is overpopulation a problem in some areas, while depopulation is a problem in other areas?