Astronauts require preserved food for extended flights.
An astronaut is a scientist who is a space explorer.
A scientist who is a space explorer requires preserved food for extended flights.
A scientist who is a space explorer requires what for extended flights?
[A] preserved food
[B] salt and water.
[C] hydration
[D] a hydraulic system
[E] useless heavy objects
[F] short-lived food
[G] hydrate their cells
[H] perishable food