Underneath its skin it has a thick layer of blubber that protects it from the cold water.
(it; has; a thick layer of blubber that protects it from the cold water; L:Underneath its skin) (a thick layer of blubber; protects; it; from the cold water)
it a thick layer of blubber
has protects
a thick layer of blubber that protects it from the cold water L:Underneath its skin
it from the cold water