Explica los motivos y da ejemplos del fenómeno de despoblamiento rural. ¿Cuáles son los factores de atracción de población que da lugar a la creación de las grandes ciudades?

What group has historically made up the largest portion of immigrants in mexico?

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.

What way does renewable energy differ from nonrenewable energy?