भारत के अतीत के बारे में जानने के लिए नेहरू जी ने किन-किन माध्यमों का सहारा लिया,? जो अनुचित है उस पर निशान लगाइए। महत्वपूर्ण स्मारकों एवं भवनों को देखाष,,/ विदेशी यात्रियों के वे वृत्तांत को पढ़ा/ इतिहास में पढ़ा,।
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pls tell me the question in English
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Destroys life in the water based ecosystem which is polluted which in turn disrupts natural food chain. Aquatic life is destroyed due to the non-biodegradable pesticides and chemicals. Water pollution affects the microbial population. There is a steep increase in the BOD levels of water.
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