Which statement about dissolved oxygen in water is true?

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Multiple Choice

Which statement about dissolved oxygen in water is true?

Explanation:
Dissolved oxygen in water decreases as temperature rises. Gas solubility in liquids drops with higher temperatures, so warmer water can hold less oxygen. At the same time, warmer water often speeds up the metabolism of aquatic organisms, increasing their oxygen demand and lowering DO further. Cold water, by contrast, can retain more dissolved oxygen. Salinity also reduces oxygen solubility, so higher salinity does not increase DO.

Dissolved oxygen in water decreases as temperature rises. Gas solubility in liquids drops with higher temperatures, so warmer water can hold less oxygen. At the same time, warmer water often speeds up the metabolism of aquatic organisms, increasing their oxygen demand and lowering DO further. Cold water, by contrast, can retain more dissolved oxygen. Salinity also reduces oxygen solubility, so higher salinity does not increase DO.

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