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 "Space explorers require preserved foods for" with the following options: 
- ground training
 - nutrients
 - Dehydration
 - survival
 - long flights
 - short flights
 - Special disposal
 - day trips


 

     long flights    