What changes are caused by heavy urban growth?

In a mercantilist system a country tries to increase its blank and decrease its blank

Why the moon is not visible from earth during the new moon ?

The declining axolotl population in mexico city is an example of in overcrowded cities. a. the surpassing of support capacity b. changes to natural environments and native species c. the lack of safe homes and tenured spaces d. the effects of a growing urban heat island