Organic food is also called ecological food and biological food, which is a relatively uniform reference for non-polluting natural foods in the world. Organic food refers to food from the organic agricultural production system, and organic agriculture refers to a kind of Sustainable agriculture using synthetic fertilizers, pesticides, growth regulators and feed additives, which emphasizes strengthening the virtuous cycle of natural life and biodiversity. Organic food certification agencies have certified the food's production, processing, storage through certification , Transportation and point of sale all meet the standards of organic food. According to the above definition, which of the following is not a basic requirement for organic food production and processing? ['The production base has not used any prohibited substances such as pesticides and fertilizers.', 'Crops are not contaminated by chemicals during harvesting, cleaning, drying, storage and transportation.', 'Seeds or seedlings are from nature and have not been modified by genetic engineering technology.', 'Seeds or seedlings grow in the natural environment and avoid planting in greenhouses.']