Which one of the following is the principal structural elements of a l

1.
Which one of the following is the principal structural elements of a living cell?

A. Oxygen

B. Hydrogen

C. Carbon

D. Nitrogen

Answer» D. Nitrogen

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Which one of the following is the principal structural elements of a living cell?

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1.	Which one of the following is the principal structural elements of a living cell?
A.	Oxygen
B.	Hydrogen
C.	Carbon
D.	Nitrogen
Answer» D. Nitrogen