<span>During the period of the Crusades, warfare between Christians and Muslims lasted nearly 200 years.</span>
It should be A. Each worker can focus on 1 thing that they are specialized in. Hope this helps
<span>Limiting contact with foreigners was the main goal of Chinese isolationism. So, in the 15th century, the foreign policy of the Ming dynasty in China became increasingly isolationist. It was the Hongwu Emperor that tried to propose the policy to ban all maritime shipping in 1371. The Qing dynasty followed in his footsteps, and often continued with the same practice of isolationism.</span>
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combusting coal, oil and gas. Researches are looking in to diverse methods of harvesting energy to reduce the stress on oil and gas as existing wells of these natural resources, especially oil are emptying fast. New sources found for oil deposit are mostly very deep underground and difficult to be extracted. For this, higher end technologies for drills and more skilled engineers are needed. Both of these increase the cost to obtain oil for oil companies (Mae 2014). As crude oil sources are diminishing
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