Final answer:
The geographic distribution of polar bears is likely to change due to the melting of sea ice and the overlapping range with grizzly bears.
Step-by-step explanation:
The geographic distribution of polar bears is likely to change under different climate change scenarios due to several factors. One important factor is the melting of sea ice in the Arctic, which is necessary for polar bears to hunt seals, their primary source of food. As sea ice decreases, polar bears may have to move to land to hunt, resulting in a shift in their distribution.
Another factor is the overlapping range of polar bears and grizzly bears. Changing climates have caused the ranges of these two species to overlap, leading to documented cases of mating and the production of viable offspring. This change in range can also impact the geographic distribution of polar bears.
Overall, the changing climate and associated impacts, such as the melting of sea ice and shifts in species ranges, are likely to affect the geographic distribution of polar bears.