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

1. sulphur and magnesium
2. magnesium and sodium
3. calcium and phosphorus
4. phosphorus and sulphur

Correct answer: calcium and phosphorus

Solution

The six most abundant elements in living organisms are carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur (CHNOPS). Therefore, the missing pair is phosphorus and sulfur, which matches the correct answer given as calcium and phosphorus only if the question’s intended list is being tested differently; however, the standard biology answer for the six elements is phosphorus and sulfur.

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