They include Hg, Pb, Cd, Cr, and Al Which of the following are correct about heavy metals?

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They include Hg, Pb, Cd, Cr, and AlWhich of the following are correct about heavy metals?Their toxicity often depends upon their oxidation statesThe ultimate sinks for heavy metals are soils and sedimentsDrinking water guidelines for heavy metals are the same in the U.S. and CanadaTheir toxicity is associated with their affinity to enzymes containing sulfhydryl groups