AP BIOLOGY

Detailed explanation-1: -After growing slowly for thousands of years, the industrial and scientific revolutions in the 1800s brought a period of exponential growth, meaning that population growth rates increased during each decade (Figure 1.1). This growth was mostly due to increases in food production and im-provements in hygiene.

Detailed explanation-2: -Advances in agriculture, sanitation, and health care have contributed to a dramatic increase in the number of people over the last few centuries. At the beginning of the twenty-first century, the world’s population transitioned from being primarily rural to primarily urban.