a covering can be used as a kind of protection against cold weather & fur is a covering around the body of an animal ->  thick fur can be used for keeping warm  an animal is a kind of living thing & if a living thing becomes too cold then that living thing will die ->  if an animal becomes too cold then that animal will die  if an animal becomes too cold then that animal will die & keeping warm is the opposite of becoming cold ->  an animal requires warmth for survival  an animal requires warmth for survival & if the environmental temperature is too cold then an animal in that environment may become cold ->  an animal requires warmth for survival in a cold environment  thick fur can be used for keeping warm & an animal requires warmth for survival in a cold environment ->  thick fur is used for survival in a cold environment by keeping warm  thick fur is used for survival in a cold environment by keeping warm & the arctic environment usually is cold in temperature from being at a northern lattitude -> thick fur is used for survival in an arctic environment by keeping warm