Biological agents can be harmful.Logical formLearned from39 sentences. Ideas can be harmful.Logical formLearned from39 sentences. A pollutant can be harmful.Logical formLearned from39 sentences. Tobacco can be harmful.Logical formLearned from39 sentences. A competition can be harmful.Logical formLearned from39 sentences. (Gas emissions) can be harmful.Logical formLearned from39 sentences. Chemicals can be harmful.Logical formLearned from39 sentences. Attitudes can be harmful.Logical formLearned from38 sentences. An (ultraviolet light) can be harmful.Logical formLearned from38 sentences. Parasites can be harmful.Logical formLearned from38 sentences. Purposes can be harmful.Logical formLearned from37 sentences. Files can be harmful.Logical formLearned from37 sentences. A contamination can be harmful.Logical formLearned from37 sentences. Exotic species can be harmful.Logical formLearned from37 sentences. Infestations can be harmful.Logical formLearned from36 sentences.