Read the excerpt from the letter to the editor. How are mixed-use areas different from what we have now? Let me tell you. Our city currently has a dense downtown area and then a massive amount of sprawl reaching out in every direction—the sprawl takes up seventy-five percent of the city’s land. Urban sprawl, the spreading of large developments of housing and shopping areas around a city’s center, has many negative cultural and environmental effects. How does the structure of this excerpt support the overall idea of the letter?