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Why would such migration be important?

In many countries, conservationists are trying to design national park systems so that "islands" of natural area (the big parks) are connected by thin "corridors" of undisturbed habitat. The idea is that this arrangement will allow animals and plants to migrate between refuges. Why would such migration be important?

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Bio-diversity is the key issue that the world is facing when much of the talk is made about environmental degradation. Many countries, Australia for example, have had an unprecedented number of animal species exterminated in the last 100 years since humans started exploiting the natural resources of the earth unscrupulously. Urban development requires than ...