Polar bears can be extinct.Logical formLearned from4 sentences. Some percent of species may go extinct.Logical formLearned from4 sentences. (Animal species) may go extinct.Logical formLearned from4 sentences. A factor can be extinct.Logical formLearned from4 sentences. Cultures can be extinct.Logical formLearned from4 sentences. Amphibians may go extinct.Logical formLearned from4 sentences. Otters can be extinct.Logical formLearned from4 sentences. A life can be extinct.Logical formLearned from4 sentences. A main line can be extinct.Logical formLearned from4 sentences. A toad can be extinct.Logical formLearned from4 sentences. Cash can be extinct.Logical formLearned from4 sentences. A crocodilian can be extinct.Logical formLearned from4 sentences. Candies can be extinct.Logical formLearned from4 sentences. A form of a breed can be extinct.Logical formLearned from4 sentences. Aliens can be extinct.Logical formLearned from4 sentences.