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Select the correct statement from the fo...

Select the correct statement from the following.

A

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

B

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

C

Methanobacterium is an anaerobic bacterium found in the rumen of cattle.

D

Biogas, commonly called gobar gas, is pure methane.

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The correct Answer is:
A
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