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Cassava
Cassava is a rich, affordable source of carbohydrates that provide more calories per acre of the crop than cereal grain crops, which makes it a very useful crop in developing nations. People prepare and eat cassava in various ways in different parts of the world, with baking and boiling being the most common methods.
In addition to eating cassava, people also use it for feeding animals, making medications, manufacturing fabrics, paper, building materials such as plywood and making bioethanol for fuel.