Final answer:
Chemical contaminants can include substances such as copper, some pottery paints, pewter, and cleaning supplies. All of the given answers are correct.
Step-by-step explanation:
Chemical contaminants can include substances such as copper, some pottery paints, pewter, and cleaning supplies. For example, copper can be a contaminant in water pipes and can enter the water supply. Some pottery paints may contain heavy metals like lead, which can be harmful if ingested or inhaled. Cleaning supplies can also contain chemicals that may be toxic if not used properly or if they come into contact with food or water.