grain | National Geographic Society
Grain is the harvested seed of grasses such as wheat, oats, rice, and corn.Other important grains include sorghum, millet, rye, and barley.Around the globe, grains, also called cereals, are the most important staple food. Humans get an average of 48 percent of their calories, or food energy, from grains. Grains are also used to feed livestock and to manufacture some cooking oils, fuels ...
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