Juan was visiting his friend Brandon’s ranch, where there were several grazing animals. Juan helped Brandon move the animals from one area to another periodically throughout his visit. When he asked Brandon why it was important to move the animals, Brandon said that it prevented overgrazing. Juan asked what problems were caused by overgrazing. Brandon replied that it could lead to desertification and wind erosion. Juan wasn’t completely sure how overgrazing causes desertification. What is the missing part of Brandon’s explanation? A. Overgrazing kills off plants whose leaves attract insects.
B. Overgrazing kills off plants whose roots are necessary to hold soil in place.
C. Overgrazing often leads to uncovering new layers of rock that are then eroded into sediments.
D. Overgrazing often leads to animals digging in the ground, which changes the flow of water over Earth’s surface.