Question

33 an element important in the formation of bone is multiple choice estrogen. phosphorus. ammonia. osteoclast

Explanation:

Phosphorus is a key element in bone - hydroxyapatite, a major component of bone. Estrogen is a hormone, ammonia is a compound not directly related to bone - formation as an element, and osteoclast is a cell type, not an element.

Answer:

B. phosphorus