C. Method: In another experiment, ferns were planted in pots with arsenic-contaminatedsoil. After 12, 16, and 20 weeks of growth, the scientists measured the amount of arsenicpresent in the ferns. Specifically, they measured the arsenic concentrations in old fronds,young fronds, and the roots. Mg/kg dry weight is a concentration measurement that meansmg arsenic per kg dry weight of fern.
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