42.
. . . . . . . . is the difference between the total number of persons who arrive and the total number of persons who leave.

46.
A population pyramid indicating a high proportion of children and rapid growth and which has abroad base is known as . . . . . . . .

48.
Migrants leaving India to settledown in the United States are . . . . . . . . to the United States and . . . . . . . . from India