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प्रश्न
Name an animal species that acts as an indicator of water pollution.
अति संक्षिप्त उत्तर
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उत्तर
Tubifex — an annelid worm that can survive in water with high organic matter (highly polluted water with low dissolved oxygen). Its presence indicates water pollution.
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अध्याय 20: Environmental Issues - EXERCISES [पृष्ठ ११६०]
