Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) People Development & Environment Environmental Issues Pollution

জলে ই. কোলাই এর উপস্থিতি _______ দূষণের একটি সূচক।

1
নর্দমা
2
তেল 
3
কীটনাশক
4
হার্বিসাইড
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