Giúp mình nhé. Read and complete the following: task: Agression has long been a natural feature of human behavior, perhaps ever since the emergence of the earliest hominids. However, there is no..............for organized group conflict before about 12.000 years ago. The development of...............conflict was closely linked to changes in economy and society, ...............probably became more serious after the adoption of agriculture. Larger population put greater pressure on land and resources, and thus increased tension between neighbors. Settled farmers also had food stores, herd animals and standing crops to steal. The stresses associated with the emergence of more hierarchical societies..............over by chiefs and kings may.............have played an important part in the growth of inter-group conflict. As human communities became organized into larger units.........warfare they waged became even more lethal. States had greater resources.............for aggression, defence and the development of new weapons. The............records of ancient societies tell of full time specialists employed by the state to produce armor and weaponry, and expensively-equipped elite forces............into being. Sometimes the............social and economic order was molded around the demands of warfare. The feudal system of medieval Europe, for example, had as one of its principal objectives, the maintenance of a force of armored knights.