Q. Which elements are most abundant in living organisms?

A) carbon, potassium, iron, magnesium, hydrogen, and nitrogen

B) oxygen, nitrogen, carbon, hydrogen, sulfur, and phosphorus

C) oxygen, calcium, phosphorus, sodium, hydrogen, and carbon

D) hydrogen, carbon, calcium, potassium, oxygen, and phosphorus

✔ Correct Answer: oxygen, nitrogen, carbon, hydrogen, sulfur, and phosphorus

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