What type of growth is displayed in the graph after the year 1800? Predicted 2050 10 Predicted 2025 8 2011 Population Reached 7 Billion O Sigmoidal 2000 Population Reached 6 Billion 6 Human Population in Billions 1987 Population Reached 5 Billion O Lag 1974 Population Reached 4 Billion O Exponential 1960 Population Reached 3 Billion 1927 Population Reached 2 Billion 2 O Linear 1800 Population Reached 1 Billion -12000 -10000 -8000 -6000 -4000 -2000 CE CE BCE BCE BCE 4000 BCE BCE BCE 2000 Source: Data from U.S. Census Bureau and the Population Reference Bureau