Chipotle restaurant workers fill orders for customers in Miami, Fla., on April 27, 2015, the day that the company announced it will only use non-GMO ingredients in its food. Joe Raedle/Getty Images hide caption

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Waiting in line for an exhibit at the Chipotle Cultivate Festival on factory farming. Festivalgoers had to visit four such exhibits to get a free burrito. Peggy Lowe/Harvest Public Media hide caption

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Now that's a big root: Sweet potatoes aren't tubers, or thickened stems, like potatoes. Sweet potatoes are roots — swollen and packed with starch. U-ichiro Murakami/Flickr.com hide caption

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Chipotle's announcement that it has removed all GMOs from its menu items is part of a growing food industry trend. From left: Nestle chocolates, Chipotle tortillas, Diet Pepsi, Kraft Macaroni & Cheese Dinner, a Subway sandwich. All of these companies have dropped ingredients over the past year in response to consumer demands. Meredith Rizzo/NPR; iStockphoto; PepsiCo; iStockphoto; iStockphoto hide caption

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Arctic Granny (right), a GMO variety created by Okanagan Specialty Fruits, got the gren light from federal regulators Friday. The apple doesn't turn brown like a conventional Granny Smith apple (left). Okanagan Specialty Fruits hide caption

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A couple of male, genetically modified Aedes aegypti mosquitoes take flight. Dr Derric Nimmo/Oxitec hide caption

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Processing often degrades a GMO ingredient to the point of making its DNA – or anything else that's genetically modified, like proteins — undetectable in the finished product. That's the case, for example, with vegetable oils made from GMO canola or soybeans. Takao Onozato/Corbis hide caption

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Scientists reprogrammed the common bacterium E. coli so it requires a synthetic amino acid to live. BSIP/UIG via Getty Images hide caption

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Samuel LaHoz/Intelligence Squared U.S.

Mattheos Koffas (left), a biochemical engineer at Rensselaer Polytechnic Institute, and Andrew Jones, a graduate student in his lab, with a flask of microbe-produced antioxidants. Dan Charles/NPR hide caption

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Corn farmer Jerry McCulley sprays the weedkiller glyphosate across his cornfield in Auburn, Ill., in 2010. An increasing number of weeds have now evolved resistance to the chemical. Seth Perlman/AP hide caption

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Labels on bags of snack foods indicate they are non-GMO food products. This fall, Colorado and Oregon will be the latest states to put GMO labeling on the ballot. Robyn Beck /AFP/Getty Images hide caption

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