Birds that prey on sage grouse generally hunt by circling over sagebrush and pouncing on sage grouse that come out into the open. Where there are power lines, however, these predators often survey the ground while sitting on the power lines. Although the area they can survey is smaller, predators sitting on power lines are more likely to catch sage grouse than are predators circling in the air. because_________,

The primary purpose of the passage is to