In the given food web from a tundra ecosystem in Nunavut, the two organisms that are omnivores are the Arctic fox and the grizzly bear.
1. **Arctic Fox:** The Arctic fox is an omnivore because it feeds on a variety of foods, including small mammals like lemmings, birds, bird eggs, carrion, berries, and even insects. This adaptability in its diet allows it to be classified as an omnivore in the food web.
2. **Grizzly Bear:** Grizzly bears are also omnivores as they have a diverse diet that includes berries, roots, insects, fish, small mammals, and carrion. Their ability to consume both plant and animal matter places them in the category of omnivores in this tundra ecosystem.
By considering the feeding habits and diet diversity of the Arctic fox and grizzly bear within the context of the food web, we can conclude that these two organisms are omnivores in this particular ecosystem.
