Because it is flexible. Think about it; the ribs protect both the lungs and the heart. If the ribs were solid bone all the way around then unless you constantly break your ribs you wouldn't be able to expand the cheat to breath. Additionally your lungs would constrict the heart to a degree that it would function properly.
Answer: Iron
Explanation:
According to the Food and Drug Administration (FDA), a commodity is a good source of a nutrient or vitamin if it provides between 10% and 19% of the Daily value of the nutrient which is the recommended amount of that nutrient to take per day.
From the label we see that Iron provides 11% of the Daily Value which means that Luigi's Manciotti is a <em>good source</em> of Iron.
