৮) রাসায়নিক কীটনাশক ব্যবহার করলে কি হয় এবং আগে কীটনাশক হিসেবে কি ব্যবহার করা হত ?
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The earliest documented chemical pesticide compounds were elements such as sulfur, heavy metals and salt. The use of elemental compounds for pest control started at the dawn of agriculture and has continued, in some cases, through the present day.
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