A) phosphorus and sulphur
B) sulphur and magnesium
C) magnesium and sodium
D) calcium and phosphorus
Correct Answer: A
Solution :
About 98% of the mass of every living organisms including bacterium and human beings is composed of just six elements, ie, carbon (C), hydrogen (H), nitrogen (N), oxygen (O), phosphorus (P) and sulphur (S).
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