Charlie has no money, but he has a well in his back yard with fresh water, which he knows he could trade for eggs, vegetables, and meat. what kind of exchange is this?

Andra has a family history of osteoporosis. her doctor advises her to eat foods rich in calcium. which foods should she add to her diet? a. fruits, especially grapes and berries b. unsaturated fats like olive and soybean oil c. beet greens, broccoli, and cheese