An essential element is one which

Options :
  1. improve plant growth
  2. is present in plant ash
  3. is available in soil
  4. is indispensable for growth and is irreplaceable
Answer and Explanation :-

Answer: Option 4

Explanation:

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And now that its ruby eyes are set into the gold, you cannot see their tear-shape, so they seem to be laughing rather than crying. It is a constant reminder to me of the human ability to create something beautiful even when things are at the darkest.
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