Burning coal produces sulfur oxides. Where did the sulfur originate?
A) from the photosynthetic plants from which the coal was made millions of years ago
B) from the atmospheric sulfur oxides that photosynthetic plants use to make their amino acids cysteine and methionine
C) from volcanos that belch sulfur into the atmosphere
D) from nuclear fusion occurring in stars that exploded billions of years ago
Correct Answer:
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