Task: Question Understanding
Input (English): Question: The prairie grass ecosystem once had a deep layer of topsoil which was protected by the grasses that covered it. Removal of these grasses for farmland is causing the soil to be eroded mainly by (A) wind and rain. (B) animal movement. (C) crops grown in the soil. (D) increased temperatures.?
Output (English): ecosystem, grasses, Removal, grasses, farmland, soil, eroded