The bears that lived in the polar region survived best if they had white coats of fur and thick layers of fat in their bodies.
(they; had; white coats of fur and thick layers of fat in their bodies) (The bears that lived in the polar region; survived; best) Context(The bears that lived in the polar region survived,List([0, 49))):(The bears; lived; L:in the polar region)
The bears that lived in the polar region survived,List([0, 49))
they The bears that lived in the polar region The bears
had survived lived
white coats of fur and thick layers of fat in their bodies
best
L:in the polar region