Dioxins and PCBs
https://www.epa.gov/dioxin/learn-about-dioxin (short read)
https://www.epa.gov/pcbs/learn-about-polychlorinated-biphenyls-pcbs (just look at "what are", "commercial use", "release and exposure", and "health effects")
Post your 3-2-1 response as always. Focus on sources and its effects on human health. Dont be afraid to do a little more research on these things either. Be prepared for test questions covering material listed here.
Also check out https://www.ucsf.edu/news/2017/06/407416/toxic-exposure-chemicals-are-our-water-food-air-and-furniture, but for this just scroll to the bottom for a list of simple things you can do to help reduce your exposure to some toxic chemicals.
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