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B Throughout history,many species of animals have been threatened with extinction.When Europeans first arrived in North America,more than 60 million buffalo (lived on the continent.Yet hunting the buffalo was so popular during the 19th century that by 1900 the animal's population had fallen to a- bout 400 before the government stepped in to protect the species. In some countries today,the elephant faces a similar challenge, as illegal hunters kill the animals for the ivory in their tusks. Yet not all animals with commercial value face this threat. The cow,for example,is a valuable source of food,but no one worries that the cow will soon be extinct.Why does the commer- cial value of ivory threaten the elephant,while the commercial