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Over one-third of the world's workers are employed in agriculture, second only to the service sector, although the number of agricultural workers in developed countries has decreased significantly over the centuries.Agriculture is defined with varying scopes, in its broadest sense using natural resources to "produce commodities which maintain life, including food, fiber, forest products, horticultural crops, and their related services".Then, wild stands that had previously been harvested started to be planted, and gradually came to be domesticated.
After gathering wild grains beginning at least 105,000 years ago, nascent farmers began to plant them around 11,500 years ago.
Pigs, sheep and cattle were domesticated over 10,000 years ago.
From around 11,500 years ago, the eight Neolithic founder crops, emmer and einkorn wheat, hulled barley, peas, lentils, bitter vetch, chick peas and flax were cultivated in the Levant.
Rice was domesticated in China between 11,500 and 6,200 BC with the earliest known cultivation from 5,700 BC, In the Andes of South America, the potato was domesticated between 10,000 and 7,000 years ago, along with beans, coca, llamas, alpacas, and guinea pigs.
Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled people to live in cities.
The history of agriculture began thousands of years ago.
The major agricultural products can be broadly grouped into foods, fibers, fuels and raw materials (such as rubber).
Food classes include cereals (grains), vegetables, fruits, oils, meat, milk, fungi and eggs.
Staple food crops were grains such as wheat and barley, alongside industrial crops such as flax and papyrus.
The Aztecs developed irrigation systems, formed terraced hillsides, fertilized their soil, and developed chinampas or artificial islands.