The correct answer to this open question is the following.
Arrange the events in chronological order. So here we go.
1.- Beginning of the Agricultural revolution.
2.- Urbanization and Industrial Revolution.
3.- World population reaches the one-billion mark.
4.- Dramatic growth in population in developing countries.
5.- Loss of millions of lives in a flu pandemic.
That is the order of events in this fascinating ride called "Human Life on Planet Earth."
With the beginning of the Agricultural Revolution, humans stopped being nomads and started to settle in different places. That was the case of teh Sumerians that settled in the middle of the Rivers Euphrates and Tigris, in the Middle East. There, they developed advanced agricultural techniques and could establish important and powerful city-states such as Nippur, Lah¿ggash, Eridu, Kish, and Uruk. That is considered the origin of human civilization.
From that point to today's pandemic times, it has been a "wild ride" for humans on Earth.
