Which of the following is not harmful for environment निम्नलिखित में से वातावरण के लिए हानिकारक नहीं है 1)Fertiliser उर्वरक 2)Manure खाद 3)Weedicide खरपतवार नाशी 4)D.D.T डीडीटी
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D.D.T this is the answer
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