About twenty-five of the 92 natural elements are known to be essential to life. Which 4 of these 25 elements make up approximately 96 percent of living matter?

Question

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The four elements that make up approximately 96 percent of living matter are carbon, hydrogen, nitrogen, and oxygen. These elements are found in all living organisms and are essential to the basic structure and function of life. Choice A includes sodium, which is not one of the essential elements, while choice B includes phosphorus, which is an important element but not one of the top four. Choice C includes calcium, which is important but not as abundant as the other three elements in living matter. Choice E includes calcium, which is not one of the top four elements in living matter.

About Twenty-Five of the 92 Natural Elements Are Known to Be