premise: if the environmental temperature / air temperature is too cold then an animal / a living thing in that environment may become cold sent2: blubber is a kind of fat sent3: fat is used to keep animals warm sent4: seals are able to live off the coast of antarctica while frogs, snakes, and pathers are not sent5: fur is a part of skin for keeping warm sent6: keeping warm is the opposite of becoming cold sent7: if a living thing becomes too cold then that living thing will die sent8: antarctica is extremely cold in temperature.
hypothesis: echo will not be produced