A considerable F utilized K accessible B balance G preserve L sane C incompatible H explore M tight D determine I available N proportion E incomparable J dreadful O converted Farming invariably interferes with the habitats of plants and animals. However, this does not necessarily mean that agriculture and biodiversity are 1)________. In fact, quite the opposite is true. The sustainable cultivation of plants for food and feed actually enables us to 2)_______ biodiversity. By 2007, there were more than twice as many people living on the planet as there were in 196I . Over the same period, the total amount of 3)_______ arable (可耕的)land grew by just 10 percent. In comparison with population growth, the expansion of arable land was small. And there are limits to further expansion. A large 4)_______ of the earth's surface - like deserts - is not suitable for cultivation, and other areas are 5)_______ by humans for roads and buildings. Some land that is rich in biodiversity needs to be preserved and thus should not be 6)________ into arable land. The tropical rain forests, for example, have the highest species density in the world, and changing this land for crop cultivation would be 7)_______ to these species' habitats and, indeed, existence. By 2050, global demand for food will have risen by 70 percent. But the expansion of land available for cultivation has its limits. This is one of the greatest challenges facing agriculture today: How do we 8)________ the increased demand for food with the need to maintain biological diversity, now and in the future? Efficient and 9)_______ use of land will be key to preserving natural animal and plant habitats. To achieve this aim will depend to a(an) 10)________ extent on the use of modern agricultural methods. If these methods are successfully applied, we believe that agriculture and biodiversity can coexist in harmony.