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3 / 13  For an element to be regarded as essential, all of the following criteria must be met, except:
A  No other element can perform the function.
B  The element is directly involved in plant nutrition.
C  The element is inorganic.
D  The plant cannot complete its lifecycle without the element.

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Source:  OpenStax, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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