A. Sodium and iron
B. Iron and manganese
C. Calcium and phosphorus
D. Magnesium and sulphur
Correct Answer: Option C
C. Calcium and phosphorus
A. Sodium and iron
B. Iron and manganese
C. Calcium and phosphorus
D. Magnesium and sulphur
Correct Answer: Option C
C. Calcium and phosphorus
Copyright warnings! Do not copy.