Foam And The Biologists From Humboldt State University, California Created An Integrated Waste Water Treatment, They Use Plants To Purify Mainly : (A) Sludge From Water. (B) Heavy Metals From Water. (C) Nitrate And Phosphate From Water. (D) All Of The Above.

The correct answer is (A) Sludge From Water.

The main purpose of FOAM is to treat wastewater around a place called Arcata and the surrounding bay through a natural system.

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