FILE - In this Tuesday, June 28, 2011, file photo, bottles of Roundup herbicide, a product of Monsanto, are displayed on a store shelf in St. Louis. German drug and chemicals company Bayer AG announced Monday, May 23, 2016, that it has made a $62 billion offer to buy U.S.-based crops and seeds specialist Monsanto. A merger between Bayer and Monsanto would put together two giant makers of chemicals, one that focuses on people and animals, and another that focuses on plants. (AP Photo/Jeff Roberson, File)

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