- Dehydrating food is used for preserving food
- Astronauts require preserved food for extended flights
- Therefore, dehydrating food can be used for preserving food for extended flights

- "The main source of food for coyotes is mice " is not a useful statement here

So, dehydrating food can be used for preserving food for extended flights
Q: Why is some food dehydrated for astronauts to eat in space?
Context:
- Dehydrating food is used for preserving food 
- Astronauts require preserved food for extended flights
- The main source of food for coyotes is mice 