Which of the following is true regarding residential segregation in Miami?
a. By 1990, Miami had black-white dissimilarity index that was about average for the U.S.
b. In Miami, Puerto Ricans are more segregated than other Hispanic groups because of darker skin
c. Unlike other cities, Miami experienced no change in the dissimilarity index from 1960 to 1990
d. Succession-invasion is occurring more rapidly in the southern part of Miami Dade County than it is in the northeastern part of the county