Officials in the northeastern United States are proposing to serve dogfish a type of shark—in schools, prisons, and homeless shelters. The fish are cheap and abundant, and their populations interfere with efforts to catch more valuable fish such as cod. However, some people argue that serving dogfish to schoolchildren is risky; use figure 38.17 to explain this argument.

Figure 38.17

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Mercury Gold Coal-fired mine power plant Mercury Methylmercury Blomagnification Shark Tuna Shrimp Plankton a. 1.0 0.979 0.9 0.8 Maximum advisable 0.7 - concentration for seafood consumers 0.6 - 0.5 - 0.391 0.4 - 0.3 0.2 - 0.1- 0.001 0.00001 Shark Fresh tuna Shrimp Plankton Mercury concentration (parts per million) b.