Of the following, which is crucial for bones? 

Calcium is a vital mineral that plays a crucial role in maintaining strong bones and teeth. It's the most abundant mineral in the human body, with about 99% of it stored in our bones and teeth. Calcium not only provides structural support but also participates in various essential bodily functions. It's involved in muscle contraction, nerve impulse transmission, blood clotting, and enzyme regulation. While other minerals like phosphorus and magnesium also contribute to bone health, calcium remains the most important building block.