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A 39,000-year-old female woolly mammoth, which was found frozen in Siberia, Russia is pictured upon its arrival at an exhibition hall in Yokohama, south of Tokyo, July 9, 2013
The passenger pigeon, the dodo and the woolly mammoth are just a few of the species wiped off the Earth by changing environments and human activities.
Now, advances in biotechnology could enable scientists to bring extinct ******* back from the grave. But critics argue the practice would only hinder conservation efforts, by resurrecting creatures that could not survive in the wild.
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