a fox is a kind of animal & a fox grows thick fur as the seasons change ->  a fox is a kind of animal that grows thick fur as the seasons change  if the environmental temperature is too cold then an animal in that environment may become cold & an animal requires warmth for survival ->  an animal requires warmth for survival in cold temperatures  temperature is a property of weather & weather changes from seasons to seasons ->  temperature changes from seasons to seasons  temperature changes from seasons to seasons & winter is a kind of season ->  temperature changes from another season to winter  temperature changes from another season to winter & winter has cold temperatures ->  temperatures become cold as the season changes to winter  an animal requires warmth for survival in cold temperatures & temperatures become cold as the season changes to winter ->  an animal requires warmth for survival as the season changes to winter  an animal requires warmth for survival as the season changes to winter & thick fur can be used for keeping warm ->  thick fur can be used for keeping warm as the season changes to winter  thick fur can be used for keeping warm as the season changes to winter & a fox is a kind of animal0 ->  some animals' fur grows thicker for staying warm as the season changes to winter  a fox is a kind of animal that grows thick fur as the seasons change & some animals' fur grows thicker for staying warm as the season changes to winter -> a fox grows thick fur to keep warm as the season changes to winter