Strains of Maize (IMAGE) Terry Collins Assoc Caption Crop diversity: Indigenous communities have always preferred growing a number of traditional crop varieties over a single high-yield -- and high-risk -- mono-cropping system. Analyses of agricultural systems in China, Bolivia and Kenya found maintaining diverse traditional cropping strategies and access to seeds has been essential for adaptation and survival. Credit US Department of Agriculture / <a target="_blank"href="http://en.wikipedia.org/wiki/File:GEM_corn.jpg">Wikipedia</a> Usage Restrictions None: This image is in the public domain because it contains materials that originally came from the Agricultural Research Service, the research agency of the United States Department of Agriculture. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.