Final answer:
The Western grey kangaroo in Australia is most likely to be able to significantly change its range in response to climate change, due to its wider habitat range and greater mobility compared to the Merriam's kangaroo rat in North America.
Step-by-step explanation:
The Western grey kangaroo in Australia is most likely to be able to significantly change its range in response to climate change. Climate change is causing shifts in habitats and ranges of many species, and the ability to move to suitable habitats is crucial for survival. The Western grey kangaroo has a wider habitat range and greater mobility compared to the Merriam's kangaroo rat in North America, making it more likely to be able to adapt and change its range.