Their black skin improves heat retention from sunlight and their "white" fur is comprised of hollow hairs that reflect sunlight, producing a whitish/yellow camouflage in their snowy, Arctic environment.
(Their black skin; improves; heat retention) (their "white" fur; is comprised; of hollow hairs) (hollow hairs; reflect; sunlight)
Their black skin their "white" fur hollow hairs
improves is comprised reflect
heat retention
of hollow hairs
sunlight