- Living things require water for survival
- Water is a kind of natural resource
- So, water is a kind of resource that living things require for survival

- Water is a kind of resource that living things require for survival
- When available resources decrease in an environment , organisms have to conserve those resources
- Hence, when the availability of water decreases in an environment, living things in that environment must conserve water to survive

- A dry environment is low in availability of water
- A desert environment is a dry environment
- So, a desert environment is low in availability of water

- When the availability of water decreases in an environment, living things in that environment must conserve water to survive
- A desert environment is low in availability of water
- So, living things in a desert environment must conserve water to survive

Therefore, living things in a desert environment must conserve water to survive
Q: Which describes a specific characteristic necessary for survival in the desert?
Context:
- Living things require water for survival 
- A dry environment is low in availability of water 
- Water is a kind of natural resource 
- When available resources decrease in an environment , organisms have to conserve those resources 
- A desert environment is a dry environment