Caused by waste disposal from baffling jobs with heavy metal contamination, such as production of chlorinated plastics factory. Some types of electric machines, or a mixture of chemical substances that kill bacteria and colored figures, etc. Most heavy metals include lead, mercury, cadmium, copper, zinc, manganese, iron, cobalt, silver, steel, etc. Those substances can accumulate and convey along the food chain in aquatic animals, which will add more volume to a level that may be harmful to aquatic consumers.
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