Which of the following criteria define an element as essential for plants?

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The plant cannot complete its vegetative growth without the element.The element performs a unique function that no other element can substitute.The element is directly involved in the plant's nutritional processes.All of the above conditions are true.

Explanation

An element is considered essential if the plant fails to complete its vegetative cycle without it, if the element has a specific role that cannot be replaced by another, and if it is directly involved in the plant's nutrition. Therefore, all these conditions together define essentiality.