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  • Image of teosinte and maize on a green background.
    Rights: John Doebley. Creative commons 2.5 licence Published 1 February 2010 Size: 65 KB Referencing Hub media

    Teosinte is an ancient grain thought to have been selectively bred into maize 6,000 to 10,000 years ago. It has few kernels, and they are enclosed in a hard casing.

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