Chemical reactions involving ________ have been proposed as energy-yielding reactions for the earliest organisms on Earth.
A. Fe, O2, and H2
B. S, O2, and H2
C. S, and O2
D. S, and H2
Answer:D
Chemical reactions involving ________ have been proposed as energy-yielding reactions for the earliest organisms on Earth.
A. Fe, O2, and H2 B. S, O2, and H2 C. S, and O2 D. S, and H2