title: How do chemical substances affect the environment?
mesh_terms: D000818:Animals; D001717:Birds; D002417:Cattle; D003634:DDT / Q000009:adverse effects; D004463:Ecology; D004787:Environmental Pollution; D005399:Fishes; D006801:Humans; D008767:Methylmercury Compounds / Q000009:adverse effects; D010573:Pesticide Residues; D010575:Pesticides / Q000009:adverse effects; D014877:Water Pollution, Chemical
chemical_list: D008767:Methylmercury Compounds; D010573:Pesticide Residues; D010575:Pesticides; D003634:DDT