At the beginning of the twentieth century, northern-born blacks were rapidly closing the educational gap between themselves and whites, but the gap widened again after 1915 . There are several reasons for this. Which is NOT one of these reasons?
a. the competition between black children and the children of European immigrants
b. the higher rate of unemployment among blacks
c. school integration
d. segregation
Question 2
About 10 million Americans, or nearly ________ percent of all persons in the labor force, work at wages so low that they remained below the official poverty threshold.
a. 1.6
b. 7
c. 10
d. 14
Model of a sequential study in which two cohorts were followed beginning at age 20. One cohort was f
Medicinal leeches on a patient’s neck. Today leeches are sometimes used in microsurgery to prevent b
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