A polar bear can be extinct.Logical formLearned from15 sentences. Vertebrates can be extinct.Logical formLearned from15 sentences. Archosaurs can be extinct.Logical formLearned from15 sentences. Elephants can be extinct.Logical formLearned from15 sentences. Some plants can be extinct.Logical formLearned from15 sentences. A primate can be extinct.Logical formLearned from15 sentences. A number of species can be extinct.Logical formLearned from15 sentences. Cultures can be extinct.Logical formLearned from15 sentences. A community can be extinct.Logical formLearned from15 sentences. A (shield volcano) can be extinct.Logical formLearned from14 sentences. Marine reptiles can be extinct.Logical formLearned from14 sentences. Races can be extinct.Logical formLearned from14 sentences. Apes can be extinct.Logical formLearned from14 sentences. An organism can be extinct.Logical formLearned from14 sentences. A liberty can be extinct.Logical formLearned from14 sentences.