Over the past century, sagebrush has dramatically expanded its range over the Colorado Plateau's grasslands. This development has been attributed to the overgrazing of the area's grasses by cattle and sheep. This example indicates that:

Question

Quizplus · Accepted Answer

The expansion of sagebrush's range over the Colorado Plateau's grasslands suggests that the normal range of sagebrush is limited by competition with grasses. This implies that both sagebrush and grasses coexist in the absence of overgrazing, and that the expansion of sagebrush is a result of reduced competition from grasses due to overgrazing by cattle and sheep. Therefore, option D is the most suitable answer.

Over the Past Century, Sagebrush Has Dramatically Expanded Its Range