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13. The attachment is the answer of this.

14.Preparation of soil is the first step before growing of crop. It helps to turn the soil and loosen it to allow the roots to penetrate deep into it. The loosening of the soil helps in the growth of several soil microbes, earthworms etc., which enrich the soil with humus and other essential nutrients. The process of turning and loosening is called ploughing. This is done using a plough, hoe and cultivators.

15.Animal husbandry, Controlled cultivation, management, and production of domestic animals, including improvement of the qualities considered desirable by humans by means of breeding. ... Agriculture and animal husbandry apply genetic techniques to improve plants and animals.

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