If this world, there are no humans live. Advantages, such as animal planet is not interference from human housing construction. There are no human beings would abate pollution because no one is causing pollution. Moreover, many kinds of animals in the world might not be descendants from the hunting of humans as well. If there are no disadvantages to human. The animal world it may be sick from epidemics to die because they do not know how to heal. The power will not be applied to benefit.
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