Fact 1: Astronauts require preserved food for extended flights. Fact 2: Preservatives are added to extend the shelf life. Given the two facts above, what prolongs the storage life of food in space?
Possible answers: a). hydrogen and oxygen; b). preservatives; c). Dehydration; d). heating liquids; e). Fuel cells; f). heat energy; g). hard outer covering; h). layers of fat;
b).