Which of t • following are required for the formation of bones and teeth?

The correct answer is (d). Calcium and phosphorus are required for the formation of bones and teeth.

• Calcium is a mineral that is found in bones and teeth. It is also important for muscle contraction, nerve function, and blood clotting.
• Phosphorus is a mineral that is found in bones and teeth. It is also important for energy production, cell signaling, and DNA synthesis.

Sodium and potassium are also important minerals, but they are not as important for the formation of bones and teeth. Iron is a mineral that is important for blood health, but it is not as important for the formation of bones and teeth.