Why Anaerobic bacteria dominates the microbial population in the benthic zone?

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The benthic zone is the region of sea (or ocean) that includes the topmost sediment layer and some water layer over it. This ecological zone is dominated by anaerobic bacteria. This region is deficient in sun light, since the sun's rays are incapable of penetrating the great depths where benthic zone exists. The productivity of this...

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