Persistent Organic Pollutants (POPs) Practice Test

Two pollutants are released into a river: (1) a fat-soluble organochlorine similar to DDT and (2) a highly water-soluble compound that is quickly metabolized by microbes. After several months, which outcome is most likely in fish?

A fishery manager compares mercury and PCBs as contaminants. The manager notes that PCBs are organic, persistent, and accumulate in fat, while mercury is an element. Which statement correctly identifies a defining POP trait highlighted by this comparison?