What are nitrates used forA. They preserve flavor in packaged foods.B. They preserve the color of meats.C. They are the objects of research.D. They cause the animals to become fatter.

Nitrates are commonly used as preservatives in the food industry, particularly in meat products. They help to maintain the color of the meat, giving it a fresh appearance and preventing the growth of harmful bacteria. This is why they are often used in processed meats like bacon, ham, and hot dogs.