About 98 % of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and :-

a) Sulphur and magnesium
b) Magnesium and sodium
c) Calcium and phosphorus
d) Phosphorus and sulphur

Kindly answer sir/mam.

The correct option is D.
The six elements that forms 98% mass of living organisms includes- carbon, hydrogen, nitrogen, oxygen, phosphorous and sulphur.

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Option (c) is correct.
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