Those foods are called "enriched."
No. Preservatives are not normally added to fresh fluid milk.
Nutrients are sometimes added to food to restore the nutritional aspects of the food which have been lost through processing. The addition of nutrients to some foods reduces the chances of poor nutrient status in many people. Sometimes it is mandated by government. Other times, it is a marketing tool for the manufacturers.
Fertilizers contain many different nutrients that aid in plant growth, and these nutrients are what plants absorb, through osmosis, to increase their speed of growth and quality. When there usually isn't a sufficient amount of nutrients, fertilizers are added to make up for this lack of necessity. The amount and quality of plant growth is called the "crop yield".
Food in which nutrients lost during processing are added back into is food fortification. Skim milk is an example because it has had the fat removed and then has Vitamin D and Vitamin A added back to it.
i fed my hamster normally but i added yogurt drops. i don't think this is necessary but it's a nice treat with a few extra nutrients.
fertilizers
enriched foods have nutrients added to them that were lost during processing. while, fortified foods have had nutrients added that are beyond what the foods originally contained.
Iron and Calcium
To give more nutrients to the plants.
Active non- nutrients are 'functional foods' or 'super foods'.These non- active nutrients imply that the food has added health benefits beyond the action of the nutrients they supply. :)
no it does not contain oil unless it has been added.
Pasta is normally made from wheat, which does contain B vitamins. It is also true that depending upon how the wheat is processed, vitamins can be destroyed by heat, and can also be added again as supplements to make up for what was destroyed by heat. So it varies.