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If you're referring to crop seed banks and not weed seed banks, the crop seed banks will help keep a record of many species and varieties of crop seeds that could be used to help re-propagate a particular type of food crop if it went extinct or was threatened somehow, creating more ability for food to be produced from those seeds that have been saved in the seed bank.

If, however, you're referring to weed seed banks, they stay in the soil for much longer than a crop producer would like and will always propogate once conditions are right. Weeds are a threat to a crop because they compete with that crop for moisture, nutrients and sunlight, and if not controlled by herbicides can reduce yields or choke out a crop altogether, leaving the farmer less to harvest and leaving more people going hungry.

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