These thick coats are necessary for them to keep them warm in the cold ocean water because they lack blubber, a thick layer of fat other marine mammals possess.
(These thick coats; are; necessary) (them; to keep; them) (they; lack; blubber, a thick layer of fat other marine mammals possess) (blubber; possess; a thick layer of fat other marine mammals)
These thick coats them they blubber
are to keep lack possess
necessary
them
blubber, a thick layer of fat other marine mammals possess
a thick layer of fat other marine mammals