Answer
The kangaroo rat alters competition between these wildflower species.
Work Step by Step
The exact mechanism of this cannot be determined by the experiment. It may feed on the one remaining species more heavily, reducing its population and allowing the other species to grow. It may also bring the other species in directly through its droppings. All else being equal, however, it is reasonable to say that kangaroo rat is at least partially responsible for the diversity of wildflowers in the area.
