Which group includes the four most abundant elements in living organisms?
A) carbon, hydrogen, oxygen, iron
B) carbon, hydrogen, nitrogen, oxygen
C) carbon, hydrogen, phosphorous, oxygen
D) carbon, nitrogen, phosphorous, oxygen
E) carbon, hydrogen, sulfur, oxygen

Question

Quizplus · Accepted Answer

Carbon, hydrogen, nitrogen, and oxygen are the four most abundant elements in living organisms. Iron (A) is important for certain functions but is not abundant in living organisms. Phosphorus (C, D) and sulfur (E) are also important, but not as abundant as the four elements listed in choice B.

Which Group Includes the Four Most Abundant Elements in Living