Which of the following is absent in polluted | vedclass

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(C) Stonefly nymphs are highly sensitive to water pollution and low dissolved oxygen levels. They serve as biological indicators of clean,well-oxygena

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Stonefly nymphs

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(C) Stonefly nymphs are highly sensitive to water pollution and low dissolved oxygen levels. They serve as biological indicators of clean,well-oxygenated water. Therefore,their presence indicates good water quality,and they are typically absent in polluted water bodies. In contrast,organisms like blue-green algae and water hyacinth often thrive in nutrient-rich,polluted water.

Which of the following is absent in polluted water?

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