The bacterial biofilms and floating weeds interact in duckweed ponds resulting in decrease of nutrient load and _______ in waste water.

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Question:The bacterial biofilms and floating weeds interact in duckweed ponds resulting in decrease of nutrient load and _______ in waste water.

1.Organic pollutant

2.Fish biomass

3.Oxygen

4.Water

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  1. The bacterial biofilms and floating weeds interact in duckweed ponds resulting in decrease of nutrient load and _______ in waste water.
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