Most harmful heavy metals causing water pollution:
Correct answer: D. Pb, Hg, Cr, Cd
- A. Zn,Mo,Mg,Ag
- B. P,Mn,B,Mg
- C. N,K,Mo
- D. Pb, Hg, Cr, Cd
Explanation
Lead, mercury, chromium and cadmium are toxic heavy metals that persist and can bioaccumulate in aquatic food chains. The other options mainly list essential nutrients or metals that are generally less toxic at ordinary concentrations.
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