Class 3 Science chapter 4| ৩য় শ্রেণির বিজ্ঞান অধ্যায় ৪ সম্পূর্ণ সমাধান| জীবনের জন্য পানি
৩য় শ্রেণির বিজ্ঞান ৪র্থ অধ্যায়ের সম্পূর্ণ সমাধান দেয়া হয়েছে আজকে। আলচনার বিষয়- জীবনের জন্য পানি। পানির উৎস, পানির প্রাকৃতিক ও মানুষের সৃষ্ট উৎস, পানি সংরক্ষন, পানি দূষন, আর্সেনিক যুক্ত পানি, নিরাপদ ও অনিরাপদ পানি, স্বাদু ও লোনা পানি সহ পানি নিয়ে বিস্তারিত আলোচনা করা হয়েছে।
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