Which of the following is true of migration?
A) One-quarter of the migrants in the United States are unauthorized.
B) By 2050, the total number of international migrants is expected to come down by half.
C) People who move into a country are called emigrants.
D) Mexico has the highest percentage of the world's migrants.
E) The United States has less than 5 percent of the world's migrants.
Question 2
Which of the following is true of the total fertility rate (TFR)?
A) TFRs are lower in the least developed nations than in developed nations.
B) TFRs below 1.8 mean that a country's population is increasing and getting younger.
C) TFRs below 2.1 mean that a country's population is decreasing and getting older.
D) High TFRs indicate increased difficulty in supporting the older population.
E) The higher the TFRs, the greater is the stability of a population.
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The gradient of the B allele of the ABO blood groups from East to West is due to waves of migration