The map above shows the distribution of the red imported fire ant (rifa), solenopsis invicta. these ants were introduced from south america into the gulf coast states of the united states in the mid-twentieth century. what description best explains the distribution of the red imported fire ants in the united states? . a) rifa cannot tolerate soils with high salinity. b) rifa can only tolerate areas with low humidity. c) rifa can only exploit soils with high clay content. d) warmer temperatures increase the distribution of rifa.