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| Killer Space Rock Snuffed Out Ancient Life | |
| 摘 要： | Long before dinosaurs ever lived,Earthsuffered a major catastrophe that wiped outmost life on the planet.About 250 millionyears ago,95 percent of species in the oceansdied out,along with 70 percent of species onland.New research may help explain what |
| 本文献已被 CNKI 等数据库收录！ | |