A) phosphorus and sulphur
B) sulphur and magnesium
C) magnesium and sodium
D) calcium and phosphorus
Correct Answer: A
Solution :
[A] About 98% of the mass of every living organism including bacterium and human beings is composed of just six elements i.e., Carbon [C], Hydrogen (H), Nitrogen (N), Oxygen (O), Phosphorus (P) and Sulphur (S). |
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