Australian mammals can be extinct.Logical formLearned from3 sentences. A tree can be extinct.Logical formLearned from3 sentences. (Elephant species) can be extinct.Logical formLearned from3 sentences. Amphibians can be extinct.Logical formLearned from3 sentences. A kingdom can be extinct.Logical formLearned from3 sentences. A worm can be extinct.Logical formLearned from3 sentences. (Salmon runs) may go extinct.Logical formLearned from3 sentences. A notion can be extinct.Logical formLearned from3 sentences. A man can be extinct.Logical formLearned from3 sentences. A (volcano northeast) can be extinct.Logical formLearned from3 sentences. Jobs can be extinct.Logical formLearned from3 sentences. A species can be extinct.Logical formLearned from3 sentences. Civilizations may go extinct.Logical formLearned from3 sentences. An animal may go extinct.Logical formLearned from3 sentences. Persons may get extinct.Logical formLearned from3 sentences.