Please Select the Correct Sequence of Steps Involved in the Creation

question 52

Multiple Choice

Please select the correct sequence of steps involved in the creation of a dead zone in a water body.
1)  Heterotrophic microbes metabolize the organic compounds synthesized by primary producers.
2) Water becomes hypoxic and toxic algal blooms may occur; animals in the area either flee or die.
3)  Water accumulates nutrients as it runs through agricultural, industrial, and urbanized regions.
4) Dissolved O₂ is consumed by metabolic activity of heterotrophs.
5)  Excess nitrate and phosphate in nutrient-rich water causes algae and cyanobacteria to flourish.

• A) 3; 5; 1; 4; 2
• B) 3; 1; 4; 2; 5
• C) 1; 3; 4; 2; 5
• D) 5; 3; 4; 2; 1
• E) 2; 1; 4; 3; 5

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