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B
Halophiles
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C
Vibrio
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D
Thermoacidophiles
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E
Cyanobacteria
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Solution
The correct option is B Methanogens Marsh gas is also called as biogas. It is also called as methane gas as it primarily consists of methane gas along with hydrogen sulfide and carbon dioxide in minor composition. It is a produced by the decomposition of vegetable matter under water by anaerobic bacteria. Bacteria useful in biogas fermentation are Methanogens. They are found in marshes.