Which human activity increases exposure to bioaccumulated mercury through seafood consumption?

Which human activity increases exposure to bioaccumulated mercury through seafood consumption?

• A. Burning fossil fuels, especially coal
• B. Planting trees
• C. Recycling plastics
• D. Solar energy

Answer: (A)

Mercury exposure from seafood comes from how mercury moves from human activities into waterways and then into fish. When we burn fossil fuels, especially coal, mercury that is in the coal is released into the atmosphere as a pollutant. This mercury travels, deposits into rivers and oceans, and microbes in water convert it into methylmercury, a form that easily accumulates in living tissues. In aquatic food chains, mercury concentrations build up as you move from smaller organisms to larger, predatory fish—a process called bioaccumulation and biomagnification. So, eating fish like tuna, swordfish, or shark can lead to higher mercury intake because these top predators tend to have the most mercury. Other options don’t introduce mercury into the environment at comparable levels, so they don’t drive this exposure in the same way.

Mercury exposure from seafood comes from how mercury moves from human activities into waterways and then into fish. When we burn fossil fuels, especially coal, mercury that is in the coal is released into the atmosphere as a pollutant. This mercury travels, deposits into rivers and oceans, and microbes in water convert it into methylmercury, a form that easily accumulates in living tissues. In aquatic food chains, mercury concentrations build up as you move from smaller organisms to larger, predatory fish—a process called bioaccumulation and biomagnification. So, eating fish like tuna, swordfish, or shark can lead to higher mercury intake because these top predators tend to have the most mercury.

Other options don’t introduce mercury into the environment at comparable levels, so they don’t drive this exposure in the same way.