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Question 1 of 75
What are the six major chemical elements present in all living protoplasm?
A. Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, Sulfur
B. Carbon, Hydrogen, Helium, Nitrogen, Phosphorus, Sulfur
C. Hydrogen, Helium, Oxygen, Nitrogen, Sulfur, Iron
D. Carbon, Oxygen, Nitrogen, Potassium, Sodium, Chlorine