Word: extinct
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...further exasperate the situation, this breed of Yak went extinct 10 years ago during the tragic Tibetan Yak Massacre of '85. Harvard is forced to clandestinely send trusted administrators in Yak disguise to serve as bearers for the elusive bubble-sheet guru...
...downside is that these complex systems can easily become unstable given the slightest change in conditions. That, according to some experts, could explain why the dinosaurs became extinct 65 million years ago. According to this notion, the popular theory that the cause was a comet crash is only half right: the comet did crash, but its effect was to destabilize dino behavior, rendering the creatures unable to compete with mammals, those hairy little animals with big ambitions. This is just the sort of behavioral disruption (induced by disease rather than a comet impact) that leads to a disintegration...
...wrong fish." Zebrafish are prolific and easy to raise under laboratory conditions, but they are advanced in evolutionary terms. A study of more primitive sea life, such as sharks or sturgeon, might yield greater amounts of evolutionary information; even better subjects would be lungfish and coelacanths, mysterious, nearly extinct creatures that lurk in the ocean depths and are the living fish closest to the fishlike ancestors of four-legged animals...
...child may go hungry, a deserving student may not finish college because of the hamburger you ate. The next hamburger you eat may mean an animal species will become extinct...
...history of laboratory contamination that has haunted researchers working on ancient DNA. Though Cano took every precaution, laboratory samples can pick up extraneous material as easily as a jacket collects lint. Last year a team of British researchers disclosed that the DNA they thought had come from an extinct mammoth belonged to a lab technician...