Which of the following is shown by an age-structure diagram?
a. The number of young people in a population as compared to the global average of young people
b. The percentages of males and females categorized as prereproductive, reproductive, and postreproductive
c. How life expectancy changes over time in urban populations
d. How much a population has grown over the last two centuries
e. The average age of immigrants and emigrants in more-developed and less-developed countries
b. The percentages of males and females categorized as prereproductive, reproductive, and postreproductive
b. The percentages of males and females categorized as prereproductive, reproductive, and postreproductive
An age-structure diagram, also known as a population pyramid, is a graphical representation of the age distribution within a population. It shows the percentage or number of people in different age groups, typically separated by gender. Therefore, the correct answer is:
b. The percentages of males and females categorized as prereproductive, reproductive, and postreproductive
To obtain this information from an age-structure diagram, you need to look at the vertical axis, which represents the different age groups, and the horizontal axis, which represents the percentages or number of people in each age group. By examining the shape of the diagram, you can determine the proportions of the population in different age categories.