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39. Tooth enamel is hardened by_which is often added to drinking water. a. iron b. chloride c. chromium d. fluoride 40. Keratin, a protein found in hair and nails, contains the mineral a. iodine b. copper c. sulfur d. zinc 41. The most bioavailable (best absorbed) form of dietary iron, also called heme iron, is found in a. grains b. meat C. milk d. eggs
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39. Tooth enamel is hardened by fluoride which is often added to drinking water;

Fluoride

40. Keratin a protein found in hair and nails contains the mineral;

c. Sulfur

41. The most bioavailable (best form) of dietary; is available in meat

b. Meat

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