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Eachyear,about10,000to100,000animalspeciesdieoff.Theyjo...
問題詳情:Eachyear,about10,000to100,000animalspeciesdieoff.Theyjointhecountlessspeciesthathavegoneextinct(滅絕)overthecourseofEarth'shistory-andextinctionmeansforever.Atleastitusedto.Scientistsarenowcl...
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