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Question
Purple sulfur bacteria areA) alphaproteobacteria that oxidize hydrogen sulfide in the presence of oxygen or nitrate.
B) gammaproteobacteria that use hydrogen sulfide as an electron donor for photosynthesis.
C) a phylogenetically heterogeneous group of microbes that reduce sulfate to sulfur.
D) thermophilic bacteria that reduce elemental sulfur to sulfide.
Answer
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