If you were to draw two graphs indicating the predicted changes in net primary productivity (NPP) for 1) North America and 2) South America with continued global warming, how would they compare? Your graphs should have time (decades) on the x-axis and average NPP on the y-axis. Question 18 options: The relationship of NPP and predicted warmer temperatures is so variable that graphs for both North and South America will not have a clear relationship between time and NPP. Both of the graphs, for North America and South America, would show average NPP declining through time. The graph for North America would show average NPP as declining slightly through time, while the graph of South America would show an increase in NPP through time. The graph for North America would show average NPP increasing slightly through time, while the graph of South America would show a decline in NPP through time. Both of the graphs, for North America and South America, would show average NPP increasing slightly through time