Fact 1: Killing microorganisms in food can be used to extend the shelf life of that food. Fact 2: Sterilization kills all viable microorganisms. Given the two facts above, what can be used to extend the shelf life of that food?

Possible answers: i. sterilization. ii. Enzymes. iii. poison. iv. chemical changes. v. hybridization. vi. gasoline. vii. rays or beams. viii. Cooking.
Answer:
i.