About 25 of the 92 natural elements are known to be essential to life. Which 4 of these 25 elements make up approximately 96% of living matter?
A) carbon, sodium, hydrogen, nitrogen
B) carbon, oxygen, phosphorus, hydrogen
C) oxygen, hydrogen, calcium, nitrogen
D) carbon, hydrogen, nitrogen, oxygen

Question

Quizplus · Accepted Answer

The four elements that make up approximately 96% of living matter are carbon, hydrogen, nitrogen, and oxygen. Option D lists these four elements. Option A includes sodium, which is not one of the four most abundant elements in living matter. Option B includes phosphorus, which is important but not as abundant as the four listed in option D. Option C includes calcium, which is only present in trace amounts in living matter.

About 25 of the 92 Natural Elements Are Known to Be