Question

which adaptation helps polar bears maintain a constant internal temperature (thermal homeostasis) in cold weather?
o three layers of fur
o blubber
o finding shade underground
o white skin

Explanation:

Blubber is a thick layer of fat that provides insulation, helping polar bears maintain a constant internal temperature in cold weather. White skin is for camouflage, not temperature - regulation. Finding shade underground is not a typical adaptation for polar bears in their open - ice habitat. Polar bears have two layers of fur, not three.

Answer:

blubber