Final answer:
Polar bears are adapted to the Arctic environment through mechanisms that aid in temperature regulation, such as their thick fur and fat layer, but they interact least with soil composition. Melting sea ice particularly threatens their survival.
Step-by-step explanation:
The question at hand involves understanding how a polar bear interacts with abiotic factors in the Arctic environment. Polar bears interact with abiotic factors such as temperature, ice formation, and atmospheric pressure by employing adaptations for temperature regulation, like having thick fur and a layer of fat under their skin, which help them conserve heat. For example, a polar bear's white fur helps with camouflage in the snowy, icy environment, contributing to their survival. Among the options provided - Temperature regulation, Ice formation, Atmospheric pressure, and Soil composition - Soil composition is the factor that polar bears interact with the least. When considering how climate change affects these animals, the melting of sea ice has a significant impact on polar bears, which rely on sea ice for hunting and living. Changes in the Arctic environment could lead to disruptions in the food web and threaten the survival of these mighty mammals.