Of course, whales and porpoises must rely on a heavy layer of blubber to keep them warm in cold water.
(whales and porpoises; must rely; on a heavy layer of blubber; to keep them warm in cold water) Context(whales and porpoises must rely,List([11, 41))):(whales and porpoises; must rely on a heavy layer of blubber to keep; them)
whales and porpoises must rely,List([11, 41))
whales and porpoises whales and porpoises
must rely must rely on a heavy layer of blubber to keep
on a heavy layer of blubber to keep them warm in cold water
them