Which of the following statements best describes the effects of eutrophication in an estuary? I. Low dissolved oxygen II. Low in nutrients, hypoxic III. Water A. I only B. II only C. I and III only D. II and III only
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Answer

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Step 1
: Understand the concept of eutrophication

Eutrophication is the process of excessive nutrient enrichment in an aquatic system, often due to runoff from the land. This leads to an overgrowth of algae and other aquatic plants, which can deplete the water's dissolved oxygen when they decompose.

Step 2
: Analyze the statements

I. Low dissolved oxygen: This is a direct consequence of eutrophication, as the decomposition of excessive plant and algae growth consumes dissolved oxygen in the water. II. Low in nutrients, hypoxic: This statement is incorrect because eutrophication is characterized by high nutrient levels, not low nutrient levels. Hypoxia, or low dissolved oxygen, is a result of eutrophication, not a cause. III. Water: This statement is too vague and doesn't provide any relevant information about eutrophication.

Final Answer

The statement "Low dissolved oxygen" best describes the effects of eutrophication in an estuary.