Question

Los Angeles, San Diego, and neighboring cities mutually support each other in their urban development and expansion. These cities have grown together into one continuous urban community, and together they are an example of a __________.

Answer 1

@SmokeyBrown whenever you get a chance

Answer 2

Hm, at first glance, I'm tempted to guess something like 'metropolis', even though this doesn't perfectly match the description. There's no doubt some better word. Do you have any options to choose from?