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Bioindicators are organisms or biological responses that reveal the quality or health of an environment, especially in relation to pollution or ecological changes. They are sensitive to specific environmental stressors, such as chemical contaminants, heavy metals, or changes in habitat conditions, and their presence, absence, or condition provides information about the ecosystem’s state. In aquatic ecosystems, species like certain ________ _______ ____ ____ ______ _________ ________ _________ ________.
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