What chemical contaminant, when present in water, can be acted upon by microbes to produce a powerful nerve toxin that may be lethal to humans?
A. copper.
B. mercury.
C. lead.
D. fluoride.
Answer:B
What chemical contaminant, when present in water, can be acted upon by microbes to produce a powerful nerve toxin that may be lethal to humans?
A. copper. B. mercury. C. lead. D. fluoride.