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Select the correct statement from the fo...

Select the correct statement from the follow-ing

A

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

B

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

C

Methanobacterium is an aerbic bacterium found in rumen of cattle.

D

Biogas commonly called gobar gas, is pure methane.

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