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How would it affect the Arctic ecosystem if the polar bear became extinct?

Relevant answers:

How would the extinction of the polar bears affect the ecosystem and biodiversity?
It would remove the Arctic regions top predator, which would upset the natural balance of the area. However, polar bears are not endangered yet, but they are threatened, and we must do all we can to...
Polar bear What would happen if it became extinct?
Not only are we loosing a beautiful animal, but also, their prey will be favorable, causing more animals to come and adapt to the cold winter.
If polar bears become extinct how will that affect us?
It probably wouldn't other than the fact that we would have lost yet another beautiful species to mans actions.
Is the polar bear becoming extinct in the arctic tundra?
No, polar bear populations are on the increase and have been for many many years. There is no actual science group, or honest conservation group that believes that they are endangered. What a few...