Some of the nontoxic metals normally found in natural water are
(A) arsenic, lead and mercury
(B) calcium, sodium and silver
(C) cadmium, chromium and copper
(D) iron, manganese and magnesium
Some of the nontoxic metals normally found in natural water are
(A) arsenic, lead and mercury
(B) calcium, sodium and silver
(C) cadmium, chromium and copper
(D) iron, manganese and magnesium