The Human Population - Weebly



The Human Population Objectives Describe how the size and growth rate of the human population has changed in the last 200 years.Define four properties that scientists use to predict population sizes.Make predictions about population trends based on age structure.Describe the four stages of the demographic transition.Explain why different countries may be at different stages of the demographic transition.Demography Demography is the ______________________________________________________________________, especially human populations.Demographers studyThe______________________________________________________________________of the populationsproperties that affect _______________________________________, such as economics and social structure.Studying Human Populations Countries with __________________________________________________ are often grouped into two general categories: _________________________________________________________________countries.Developed Countries Developed countries have higher average incomes, slower population growth, diverse industrial economies, and stronger social support systems.Developing Countries Developing countries have lower average incomes, simple and agriculture-based economics, and rapid population growth.Population Growth and Standard of Living Appears to be an ______________________relationship between a ____________________________ _____________________________________________________________________________________ Human Population Over Time The human population underwent _________________________________________________________, meaning that the population growth rates increased during each decade.Human Population Over Time Why was human population increasing so rapidly?_________________________________________________________________________________________________________________________________________________________________Can human population continue to grow exponentially?Why or why not? Forecasting Population Size Why is forecasting population size important?____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Forecasting Population Size Demographers predict future population sized based on__________________________________________________________________________________________________________________________________________________________________________Age Structure Age structure—_____________________________________________________________________________________________________________________________________________________________________Age structure influences whether ______________________________________________________________________________________________________________________________________________________Age Structure Countries that have high rates of growth usually have_____________________________________________________________________________________________________________________________________In contrast, countries that have slow __________________________________________________________________________________________________________________________________________________Age Structure Age structure can be graphed in a ____________________________________________________, a type of double sided bar graph.United States Population Picture Did you ever hear the term Baby Boom?What is it?United States Population Picture United States population had a post-war baby boom period, significantly affecting population trends.______________________________________________________Created population bulge.As members of this group have raised families, they have had a significant influence on U.S. population growth and trends.Survivorship Survivorship _______________________________________________________________________________________________________________________________________________________________________Type I Survivorship Curve Type II Survivorship Curve Type III Survivorship Curve Fertility Rates A fertility rate ________________________________________________________________ ____________ _________________________________________________________________________________________Replacement Level Replacement level is________________________________________________________________________ This number is slightly more than 2 because not all children born will survive and reproduce.Fertility Rates In _______________________________________________________________________________________ for the first time in US History.Fertility rates __________________________________________________________________________________________________, but recently has been growing partly___________________________________________________________________________________________________Migration Migration in general, _____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________The populations of many developed countries might be ___________________________________________________________________________________________________________________________________Migration Migration ________________________________________________________________________________ _________________________________________________________________________________________Declining Death Rates The dramatic increase in Earth’s human population in the last___________________________has happened because ___________________________________________________________________________________________________________________________________________________________________________Declining Death Rates Death rates have declined mainly because more people now have access ___________________________ _______________________________________________________________________________________ The discovery of ___________________________ in the 20th century also contributed to the declining death rates.Life Expectancy Life expectancy is ___________________________________________________________________________________________________________________________________________________________________Life expectancy is most affected by __________________________________________________, the death rate of infants less than a year old.Expensive medical care is not needed to prevent infant deaths. Infant health is more affected by the parents’ access to ________________________________________________________________________________Life Expectancy The graph shows that average life expectancy worldwide has increased to more than 67 years old. But, new threats, such as__________________________________________________ are arising as populations become ________________________________________The Demographic Transition The Demographic Transition is a model that describes how __________________________________________________________________________________________________________________________________Stages of the Transition In the first stage of the demographic transition, a society is in a ________________________________________________________________________________________ The ______________________________ and the ____________________________________are both at high levels and the population size is __________In the second stage, a _____________________________________________ occurs. Death rates decline as ___________________________________________________________________________ improve. But, birth rates remain high, _____________________________________________________________________In the third stage, __________________________________________________________ because birth rate ______________________________________________. As the birth rate becomes close to the death rate, the population size stabilizes. However, the population is ___________________________________________________________________________________________________________________In the fourth stage, ________________________________________________________________________, so the size of the population begins to _________________________It has taken from ______________________________________________________________________ for the demographic transition to occur.Women and Fertility The factors most clearly related to a decline in birth rates are _______________________________________________________________________________________________________________________Women and Fertility In the demographic transition model, the _______________________________________________________ ____________________________is usually the result of increased levels of ___________________________Women and Fertility Educated women find that they do not need to bear ________________________________________________________________________________________________________________________________________________________________________________________________________________________________Women and Fertility Women are able to contribute to their family’s __________________________________________________ while spending less energy bearing and caring for children.Women and Fertility As countries modernize, parents are more likely to work away from home______________________________________________________________________________________________________________________All of these reasons contribute to ______________________________________________________________________________________________________________________________________________________ ................
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