Respuesta :

pollution
cities
cars
schools
bussiness
Some examples are, 1. crowding, 2. Housing, 3. Homelessness, 4. Traffic and transportation, 5. Air pollution, 6. Mental health problems, 7. public education, 8. crime, 9. Fiscal problems, 10. population.
 
                                                 Hope this helped

                                                            Enjoy