Adaptations Polar bears are excellent swimmers and their webbing between their feet, hollow hairs and thick layer of blubber are 
(hollow hairs and thick layer of blubber; are; ) Context(hollow hairs and thick layer of blubber are,List([85, 128))):(Adaptations Polar bears; are; excellent swimmers and their webbing between their feet)
hollow hairs and thick layer of blubber are,List([85, 128))
hollow hairs and thick layer of blubber Adaptations Polar bears
are are
excellent swimmers and their webbing between their feet