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Select the correct statement from the fo...

Select the correct statement from the following

A

Activated sludge-sediment in settlement taks of sewage treatment plant is a rich source of aerobic bacteria

B

Biogas is produced by the activity of aerobic bacteria on animal waste

C

Methanobacterium is an aerobic bacterium found in rumen of cattle

D

Biogas, commonly called gobar gas, is pure methane

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