sentences: keeping warm is the opposite of becoming cold & if a living thing becomes too cold then that living thing will die ->  animals require warmth for survival  animals require warmth for survival & if the environmental temperature / air temperature is too cold then an animal / a living thing in that environment may become cold ->  animals require warmth for survival in cold environments  blubber is a kind of fat & fat is used to keep animals warm ->  blubber is used to keep animals warm  blubber is used to keep animals warm & fur is a part of skin for keeping warm ->  blubber and fur are used by animals for keeping warm  animals require warmth for survival in cold environments & blubber and fur are used by animals for keeping warm ->  blubber and fur are used for survival in cold environments  blubber and fur are used for survival in cold environments & antarctica is extremely cold in temperature ->  blubber and fur are used for survival in antarctica  blubber and fur are used for survival in antarctica & seals are able to live off the coast of antarctica while frogs, snakes, and pathers are not -> seals are able to live off the coast of antarctica because they have fur and blubber