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Bacteria are among the most abundant and diverse microorganisms on Earth, playing a pivotal role in maintaining ecological balance and benefiting human life in multiple ways. One of the most important contributions of bacteria is in agriculture and soil fertility. Nitrogen-fixing bacteria, such as *Rhizobium* in leguminous plants, convert atmospheric nitrogen into ammonia, which is usable by plants, enhancing soil fertility and crop _______ _____ ______ _______ ___ ________.
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