I'm not sure about that it shows signs of evolution, you can't miss the fact that cities have become more structurally complex over the millennia.
Although the Neo-Latin word
civilizatio means "the building of cities," an individual city is not a civilization. A civilization is a group of cities that exchange raw materials, food, goods, services, technology, information, culture, people, etc. The changes taking place in a single city are more analogous to "growth" and "maturation" in biological organisms, rather than the "evolution" of a species or a clade. I would judge that in order to reproduce, a civilization must spawn other civilizations.
Of course, this has, arguably, happened. Greece and Rome were "descendants" of Mesopotamia. Japan and Korea were "descendants" of China. Are the USA and Australia "descendants" of England/Britain, or merely "new growth"?
But today the point is moot because all of the world's civilizations are heading (or in some cases being dragged kicking and screaming
) toward unification into one global civilization.
One would be tempted to say that this is something that biological organisms cannot do, so it ruins the comparison. But the first multicellular organisms were groups of single-cell organisms that evolved in ways which allowed them to combine into a single entity, and then specialize in different organic functions.
Homeostasis also seems to apply. After all, cities are run; they expand according to a certain pattern and evolve without disturbing the inner workings.
There ya go!