- 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
- So, 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
- Therefore, an animal requires warmth for survival in cold environments

- Cold environments have cold temperatures / weather
- Climate is the average weather / temperature in an area
- Hence, a cold environment means a cold climate

- An animal requires warmth for survival in cold environments
- Layers of fat are used to keep animals warm
- So, layers of fat are used by animals to survive in cold environments by keeping warm

- Layers of fat are used by animals to survive in cold environments by keeping warm
- Traits that help animals survive in a certain kind of environment are often found in animals in that environment
- So, layers of fat are often a part of animals that live in cold climates

- Layers of fat are often a part of animals that live in cold climates
- Blubber is a kind of fat
- Therefore, blubber is often a part of animals that live in cold climates

Hence, blubber is often a part of animals that live in cold climates
Question
Which adaptation allows a walrus to stay warm in cold water?

Context
- Traits that help animals survive in a certain kind of environment are often found in animals in that environment 
- Keeping warm is the opposite of becoming cold 
- If a living thing becomes too cold then that living thing will die 
- Layers of fat are used to keep animals warm 
- Blubber is a kind of fat 
- If the environmental temperature / air temperature is too cold then an animal / a living thing in that environment may become cold 
- Cold environments have cold temperatures / weather 
- Climate is the average weather / temperature in an area 
- An animal is a kind of living thing