- An animal can survive in an environment with little food by storing fat
- Cold environments usually have little food for animals
- Therefore, 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
- So, 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
- Therefore, 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
- So, 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
- So, 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
- Therefore, 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
- Therefore, 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
- Therefore, 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
- Hence, layers of fat are often a part of animals that live in cold climates

Hence, layers of fat are often a part of animals that live in cold climates
[Question]Which characteristic is most common among animals living in a cold climate?
[Context]- An animal can survive in an environment with little food by storing fat 
- Traits that help animals survive in a certain kind of environment are often found in animals in that environment 
- Layers of fat are used to keep animals warm 
- Cold environments have cold weather / temperatures 
- Climate is the usual kind of weather in a location over a period of time 
- If the environmental temperature / air temperature is too cold then an animal / a living thing in that environment may become cold 
- If a living thing becomes too cold then that living thing will die 
- Cold environments usually have little food for animals 
- An animal is a kind of living thing 
- Keeping warm is the opposite of becoming cold