Which of the following decreases the dissolved oxygen in water?

Organic matter

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Fluoride

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Carbonates

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Methylmercury

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Solution

The correct option is D Organic matter
Dissolved oxygen levels are influenced by temperature and salinity. The solubility of oxygen, or its ability to dissolve in water, decreases as the waters temperature and salinity increase.
Bacteria, fungi, and other decomposer organisms reduce DO levels in estuaries because they consume oxygen while breaking down organic matter.

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