The four most common elements in living organisms are
A. C, H, O, Fe.
B. C, H, O, Na.
C. C, H, O, N.
D. C, N, O, Na.
Answer:C
The four most common elements in living organisms are
A. C, H, O, Fe. B. C, H, O, Na. C. C, H, O, N. D. C, N, O, Na.