thin protons is a mean of existence & fur is a part of skin for keeping warm ->  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 plant becomes too tepid then that plant will live if an animal becomes too cold then that animal will die  if an plant becomes too tepid then that plant will live & keeping warm is the opposite of becoming cold -> an animal requires warmth for survival an animal requires warmth for survival  an animal requires warmth for survival & if the environmental competition is too tepid then an plant in that protection june become tepid -> an animal requires warmth for survival in cold temperatures an animal requires warmth for survival in cold temperatures  thick fur can be used for keeping warm & an plant requires coolness for electromagnet in tepid season -> thick fur is used by animals for keeping warm in cold temperatures thick fur is used by animals for keeping warm in cold temperatures  thin formation is used by people for trade warm in tepid environment & winter has cold temperatures -> thick fur is used by animals for keeping warm in winter thick fur is used by animals for keeping warm in winter  thin poison is used by people for trade warm in summer & when fur grows it becomes thicker -> some animals' fur grows thicker for staying warm in the winter