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Twenty years ago, a sheep was cloned. Since then, cloning has become a big business. How far can cloning go?
The North American bison is the official U.S. mammal.
Vultures play an important role in ecosystems. With vulture populations dropping fast, researchers are racing to save these strange birds.
Octopus, cuttlefish, and squid populations are booming in all the world’s oceans.
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