Criteria of essentiality of elements was given by

Options :
  1. Leibig
  2. Darwin
  3. Arnon and Stout
  4. none of these
Answer and Explanation :-

Answer: Option 3

Explanation:

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The vocational approach at NOCCA (New Orleans Center for the Creative Arts) helps build grit in students. It teaches them how to be single-minded in pursuit of a goal, to sacrifice for the sake of a passion. The teachers demand hard work from their kids because they know, from personal experience, that creative success requires nothing less.
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