Final answer:
Jams and dried meats do not require refrigeration because they have low water content and high sugar or salt content, which create an environment where bacteria cannot grow. This is due to osmosis and the preservative properties of sugar and salt.
Step-by-step explanation:
Jams and dried meats often do not require refrigeration to prevent spoilage because they have low water content and high sugar or salt content. These conditions create an environment where bacteria and other microorganisms cannot grow and multiply, reducing the risk of spoilage. This is due to a process called osmosis, where water is drawn out of the microorganism, causing it to shrink and die. The sugar or salt acts as a preservative, extending the shelf life of these food items.