premise: a covering can be used as a kind of protection against cold weather sent2: if the environmental temperature is too cold then an animal in that environment may become cold sent3: keeping warm is the opposite of becoming cold sent4: an animal is a kind of living thing sent5: if a living thing becomes too cold then that living thing will die sent6: the arctic environment usually is cold in temperature from being at a northern lattitude sent7: fur is a covering around the body of an animal.
hypothesis: thick fur is used for survival in an arctic environment by keeping warm