Fact 1: Astronauts require preserved food for extended flights.

Fact 2: An astronaut is a scientist who is a space explorer.

Given the two facts above, answer the question "A scientist who is a space explorer requires what for extended flights?" with the following options: 
- preserved food
 - salt and water.
 - hydration
 - a hydraulic system
 - useless heavy objects
 - short-lived food
 - hydrate their cells
 - perishable food


 

 preserved food        