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৪. প্ৰাণী আৰু উদ্ভিদৰ দ্ৰৱ্যৰ পৰিবহণ
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৫. উদ্ভিদৰ প্ৰজনন আৰু বংশবিস্তাৰ
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৯. ভৌতিক আৰু ৰাসায়নিক পৰিৱৰ্তন
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