R Ram Sharma 🎓 Coach ⭐ 193.88K Points 📊 Biology Q. Bones are mainly made up of (A) calcium and iron (B) calcium and phosphorus (C) calcium and magnesium (D) calcium and sulphur 👁️ Show Answer 🔗 Share ⚡Menu ✅ Correct Answer: (B) calcium and phosphorus You must be Logged in to update hint/solution 💬 Discussion 💬 Comment