What are the sources of sulfur in the atmosphere?
A) natural and human sources, in equal amounts
B) volcanoes and hot springs, but mostly (about 75%) human activities such as burning coal
C) mostly (over 90%) volcanoes and photosynthetic bacteria
D) mostly transportation modes, such as autos, trucks, and planes
E) decomposition and small amounts from pollution
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A)are needed in smaller quantities than macronutrients
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