Answer:
d. calcium
Step-by-step explanation:
Calcium is one of the elements that is important for bones. Bones are not able to make calcium, which means that this needs to be obtained from the food that you eat. Milk, cheese, ice cream, leafy green vegetables (such as spinach and collard greens), salmon, sardines (with the bones), tofu and yogurt. Calcium is important in children, as well as adults, as bones are constantly being remodeled and renewed. Moreover, older adults are more at risk for brittle bones.