<p>A Changing Human Population Studying Human  Demography – Populations ______(usually human populations)</p><p> Countries are divided into 2 categories by demographers: • Developed – ______• Developing – ______Forecasting  Demographers try to predict what will happen to a population in order Population Size ______</p><p> Demographers look at several different factors to make their predictions Age Structure  Age structure describes the ______</p><p> Countries with ______have more ______</p><p> Countries with ______have ______</p><p>Survivorship  Survivorship - ______</p><p> To predict survivorship, demographers study a group of people born at the same time and notes when each member of the group dies.</p><p>Fertility Rates  ______</p><p> Replacement level – ______</p><p>Declining Death  Increased access to food, clean water, and safe sewage disposal have lead Rates to a ______</p><p> This decrease has ______in the human population than the birth rate. Migration  Migration in general______ The populations of many developed countries might be decreasing ______</p><p>Declining Death . The dramatic increase in Earth’s human population in the last 200 years has Rates happened because ______. . Death rates have declined mainly because more people now have access to ______. . The ______in the 20th century also contributed to the declining death rates. Life Expectancy  ______</p><p> Infant mortality rates have the ______on life expectancy numbers</p><p> ______</p><p> ______in developed and developing nations. Demographic . The demographic transition is the Transition ______. . ______causes ______that then affects population growth rates.</p><p>Women and . A decline in birth rates can most clearly be related to ______Fertility ______for women. . Educated women ______and find that they ______to ensure that some will survive. . Women are able to ______for their families while spending ______</p>