Chemical reactions involving ________have been proposed as energy- yielding reactions for primitive organisms.
A) iron, sulfur, and oxygen
B) iron, oxygen, and hydrogen
C) sulfur, oxygen, and hydrogen
D) iron, sulfur, and hydrogen

Question

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Iron, sulfur, and hydrogen have been proposed as energy-yielding reactions for primitive organisms. This is known as the iron-sulfur world hypothesis, which suggests that the first living organisms on Earth may have used metal-sulfur compounds as their source of energy before the emergence of photosynthesis. The reaction involves the oxidation of reduced iron and reduced sulfur compounds by molecular hydrogen to produce energy and the oxidized forms of the metals and sulfur.

Chemical Reactions Involving ________Have Been Proposed as Energy- Yielding Reactions