Study Fig. 1, which shows information about four countries which have a low population density. Country Total population Area (sq. kms) Population density (people per sq. km) Angola 20 609 294 1 246 700 16.5 Australia 22 730 400 7 702 466 3.0 Finland 5 420 030 303 893 17.8 Mongolia 2 736 600 1 564 100 1.7 [Figure 1] Study Fig. 2, which shows information about world population and the extinction of species of plants and animals. Key — number of extinct species of plants and animals --- world population (millions) [Figure 2] is a line graph with 'year' (1800 to 2010) on the x-axis, 'number of extinct species of plants and animals' (0-60000) on the left y-axis, and 'world population (millions)' (0-8000) on the right y-axis.