Section 2 Understanding Human Population Dynamics Chapter 19 Objectives Describe the factors that affect carrying capacity Compare the exponential model and the logistic model of population growth. Explain how change in population density is affected by emigration, immigration, birth rate, and death rate Relate these factors to the exponential growth of the human populations

History of Human Population Growth Section 3 Human Population Growth Chapter 19 History of Human Population Growth The Development of Agriculture About 10,000 to 12,000 years ago, the development of agriculture increased the growth rate of the human population. The Population Explosion Improvements in hygiene, diet, and economic conditions accelerated population growth.

History of Human Population Growth, continued Section 3 Human Population Growth Chapter 19 History of Human Population Growth, continued After World War II, the human population grew at the fastest rate in history WHY? Better sanitation and medical care in poorer countries. Other reasons for human population growth? Advancements in technology: transportation, construction

Chapter 19 Population Dynamics Age Structure Section 1 Understanding Populations Chapter 19 Population Dynamics Age Structure A population’s age structure indicates the percentage of individuals at each age.

History of Human Population Growth, continued Section 3 Human Population Growth Chapter 19 History of Human Population Growth, continued Population Growth Today Developing countries have faster human population growth and lower standards of living than developed countries do. Think about that statement. What question should you ask after hearing it?

Human Population Growth Section 3 Human Population Growth Chapter 19 Human Population Growth

Chapter 19 The Exponential Model Section 2 Measuring Populations Chapter 19 The Exponential Model The exponential model describes perpetual growth at a steady rate in a population. The model assumes constant birth and death rates and no immigration or emigration.

Follow-Up Why is the human population following an exponential growth model? Predict what will cause the human population to reach it’s carrying capacity Density dependent or Density independent factor?