Why scientists considered lead, cadmium, nickel and mercury traces in the atmosphere are very dangerous. Justify your answer with sources, and effects on human health.
the macromolecules and their cellular functions are disrupting by the exposure of human body with these heavy metals... they get transported into body cells and tissues and cause destruction..
they lead to the mental disorder, they damage the liver, lungs, kidney etc .. exposure for long term may cause some diseases like Parkinson’s disease and Alzheimer’s disease..long term exposure damages reproductive system and ultimately leads to the cancer...
Hence their traces in the atmosphere are considered dangerous.
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