____ is the number of people living in a square mile. In the future, economically developed nations may not have enough money to
take care of older citizens because of ____. In low-income nations, _____ is one reason for the low standard of living. Options for “___ is the number of people living in a square mile:
a. population density
b. population control
c. population growth
Options for “In the future, economically developed nations may not have enough money to take care of older citizens because of:
a. immigration
b. underpopulation
c. urbanization
Options for “In low-income nations, _____ is one reason for the low standards of living:
a. overpopulation
b. population limits
c. underpopulation
