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In Greece and Rome, the major cereals have been wheat, emmer, and barley, alongside vegetables together with peas, beans, and olives. The word agriculture is a late Middle English adaptation of Latin agricultūra, from ager 'subject' and cultūra 'cultivation' or 'rising'. While agriculture often refers to human actions, sure species of ant, termite and beetle have been cultivating crops for as a lot as 60 million years. Agriculture is defined with various scopes, in its broadest sense using natural sources to "produce commodities which maintain life, together with food, fiber, forest merchandise, horticultural crops, and their associated companies". A system of companion planting known as the Three Sisters was developed in North America. In Eurasia, the Sumerians started to live in villages from about 8,000 BC, counting on the Tigris and Euphrates rivers and a canal system for irrigation. Ploughs appear in pictographs round three,000 BC; seed-ploughs...