About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and:
A
Calcium and phosphorus
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B
Phosphorus and sulphur
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C
Sulphur and magnesium
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D
Magnesium and sodium
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Solution
The correct option is A Calcium and phosphorus About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen, calcium, and phosphorus.