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B
Cyanobacteria
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C
Fucus species
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D
Chlorella species
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Solution
The correct option is A Methanogens Methanogens are the primitive bacteria belonging to archaea which are able to produce methane. These organisms can utilise the carbon dioxide and hydrogen gas to form methane. These organisms are found in marshy areas, swamps and in the stomach of certain animals. These organisms are responsible for methane production in the stomach of cattle like cows and buffaloes. The anaerobic breakdown of the complex molecules help in digestion.