<span>The Russian serf system arose as peasants fled to the protection of large landowners to avoid Mongol taxes.</span>
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Advantages: This method helps to eliminate weeds, insects and other germs effecting the soil. Shifting cultivation allows for farming in areas with dense vegetation, low soil nutrients content, uncontrollable pests. Disadvantages: In shifting cultivation, trees in the forests are cut
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I think it is A I believe so
Fibers are classified by their chemical origin, falling into two groups or families: natural fibers and manufactured fibers. Manufactured fibers are also referred to as man made or synthetic fibers
