Here are the answers to the questions based on the information provided:
Question 1: D. Pollution
Question 2: D. communities that exist outside the ring of suburbs and are typically populated by even wealthier families who want more space and have the resources to lengthen their commute.
Question 3: D. Demography
Question 4: C. communities surrounding cities, typically close enough for a daily commute in, but far enough away to allow for more space than city living affords.
Question 5: C. achieving development that occurs without depleting or damaging the natural environment.
Question 6: C. Refugee
Question 7: B. Demography
Question 8: D. Thomas Malthus
Question 9: A. Exurbs
Question 10: B. Fracking
Question 11: A. Zero Population Growth
Question 12: B. Mortality Rate
Question 13: C. Population Composition
Question 14: A. how many people can live in a given area considering the amount of available resources.
Question 15: C. Sex ratio
Question 16: D. Demographic Transition Theory
Question 17: C. Sustainable Development
Question 18: A. Gentrification
Question 19: C. the migration of economically secure white people from racially mixed urban areas and toward the suburbs.
Question 20: D. a picture of population distribution by sex and age.