Answer:
They will grow thinner, darker fur.
Step-by-step explanation:
This is because as temperatures rise, the Arctic sea ice melts, which makes it more difficult for polar bears to hunt their main prey, seals. As a result, they are likely to experience food shortages, which can lead to malnutrition and weight loss, resulting in thinner bodies. Additionally, as the sea ice melts, polar bears are forced to swim longer distances, which can also lead to increased energy expenditure and further weight loss. Therefore, it is unlikely that polar bears will grow thicker, warmer coats in response to rising temperatures.