Answer:
B. mercury
Explanation:
Mercury is one of the most common toxic chemicals that can be found in contaminated fish. This is because mercury has become a common pollutant in rivers and other waterways since it it commonly used in mining and industrial operation, and these operations end up throwing the mercury into the waterbodies, where the fish absorb it.
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Over 23,000 men fell as casualties in the one-day Battle of Antietam, making it the bloodiest day in American history. The Union victory at Antietam resulted in President Abraham Lincoln issuing his Preliminary Emancipation Proclamation on September 22, 1862.