Pregnant women are wise to avoid eating __________,which are heavily contaminated with __________.

Question

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Long-lived predatory fish such as tuna, swordfish, and shark are at the top of the food chain and tend to have high levels of mercury, which is harmful to a developing fetus. Freshwater fish can also be contaminated, but lead and polychlorinated biphenyls are less commonly found in fish and are not as much of a concern for pregnant women. Radiation is also not a common contaminant in fish.

Pregnant Women Are Wise to Avoid Eating __________,Which Are Heavily