sentences: an animal can survive in an environment with little food by storing fat & cold environments usually have little food for animals ->  an animal can survive in a cold environment by storing fat  if a living thing becomes too cold then that living thing will die & an animal is a kind of living thing ->  if an animal becomes too cold then that animal will die  if an animal becomes too cold then that animal will die & an animal can survive in an environment with little food by storing fat0 ->  an animal requires warmth for survival  an animal requires warmth for survival & if the environmental temperature / air temperature is too cold then an animal / a living thing in that environment may become cold ->  an animal requires warmth for survival in a cold environment  an animal requires warmth for survival in a cold environment & layers of fat are used to keep animals warm ->  layers of fat are used by animals to survive in a cold environment by keeping warm  an animal can survive in a cold environment by storing fat & layers of fat are used by animals to survive in a cold environment by keeping warm ->  layers of fat are used by animals to survive in a cold environment  layers of fat are used by animals to survive in a cold environment & traits that help animals survive in a certain kind of environment are often found in animals in that environment ->  layers of fat are often a part of animals that live in cold environments  cold environments have cold weather / temperatures & climate is the usual kind of weather in a location over a period of time ->  a cold environment means a cold climate  layers of fat are often a part of animals that live in cold environments & a cold environment means a cold climate -> layers of fat are often a part of animals that live in cold climates