Assertion: arsenic's effect | /r/HasProperty | demonstrated
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Source sentences:
text: Effect of phosphate on arsenic hyperaccumulation by ferns - Competitive effect of arsenate and phosphate in soils has been demonstrated (Livesey & Huang, 1981; Manning & Goldberg, 1997; Smith et al., 2002; Tu & Ma, 2003), as well as the interactions of these two elements in plants (Asher & Reay, 1979; Meharg & Macnair, 1992; Fourqurean & Cai, 2001).