Based on your hypothesis, which populations would be hurt if bears were added

Bears are omnivores.

Explanation:

The most commonly eaten kinds of plants are fleshy roots, fruits, berries, grasses, and forbs. If bears are on the hunt, their prey can include fish (especially salmon), rodents like ground squirrels, carrion, and hoofed animals like moose, elk, caribou, and deer. They are especially good at catching the young of these hoofed species. Grizzly bears can also target domestic animals like cattle and sheep and cause economically important losses for some ranchers.

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