The Hubbard Brook Experimental Forest consists of several adjacent watersheds (regions of the forest drained by a single stream), all of which drain into Hubbard Brook. In one of the watersheds, researchers cut down all of the trees and sprayed the entire watershed with herbicides to prevent any re-growth of plants for a period of three years. The roots of trees and shrubs were not removed, and the above-ground parts of plants were left to decay. Other watersheds were left untouched as controls.
A. True
B. False