Living organisms are composed predominantly of which of the following groups of elements:
A) Hydrogen (H) ; oxygen (O) ; carbon (C) .
B) Hydrogen (H) ; oxygen (O) ; phosphorus (P) .
C) Hydrogen (H) ; phosphorus (P) ; carbon (C) .
D) Hydrogen (H) ; sodium (Na) ; chloride (Cl) .
E) Oxygen (O) ; sodium (Na) ; chloride (Cl) .
Correct Answer:
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