Answer;
preservatives and low temperature
Explanation;
-Food preservation refers to any technique that may be used to prevent food from spoiling. It involves preventing the growth of bacteria, fungi, or other micro-organisms.
-Chemical preservatives are food additives that are specifically added to prevent microbial spoilage. they include organic acids, epoxides and propionates, etc.
-Subjecting micro-organisms to low temperature also inhibits their growth thus preventing spoilage of food.