Mercury
A. is bio-concentrated (concentrations increase up the food chain), with the result that large fish like tuna may contain unacceptable levels.
B. may be added to the atmosphere through the burning of coal, incineration of waste, smelting association with ore processing and processing of batteries.
C. is most toxic to humans in the form of methyl mercury.
D. is transferred from the atmosphere into water, where microorganisms transform it to methyl mercury.
E. All of the choices are correct.
Answer: E
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