Why did the removal of wolves from northern wisconsin change the makeup of the plants in the forest?

a. wolves used to feed on some of the plants there, and without wolves, the plant population exploded.

b. wolves are important pollinators of many forest species, and without wolves, fewer plants could pollinate.

c. wolves disperse the seeds of pine trees, and without wolves, the seeds couldn't land in new places to germinate.

d. wolves are predators of deer, and without wolves, more deer survived and ate more forest plants.