Which adaptation is used by polar bears to maintain internal homeostasis in cold temperatures?
three layers of fur
blubber
finding shade underground
white skin

The right option is; blubber

Blubber is the adaptation used by polar bears to maintain internal homeostasis in cold temperatures.

Blubber is the thick layer of fat located below the skin of polar bears. Blubber is about 10cm (4 inches) thick. Blubber is mainly used for insulation. It helps polar bears to maintain internal homeostasis in cold temperatures. Blubber also serve other functions such as helping the polar bears to float naturally when swimming in water, and it is also used for storing food in case there is limited food supply such as during summer.