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Which elements are most abundant in living organisms?

oxygen, nitrogen, carbon, hydrogen, sulfur, and phosphorus
carbon, potassium, iron, magnesium, hydrogen, and nitrogen
hydrogen, carbon, calcium, potassium, oxygen, and phosphorus
oxygen, calcium, phosphorus, sodium, hydrogen, and carbon

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

Explanation:

Living organisms often contain trace amounts of several elements, but the most abundant ones are oxygen, carbon, hydrogen, nitrogen, calcium, sulphur and phosphorus.

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