Among the following elements, which one is not a constituent of chlorophyll?

Options :
  1. carbon
  2. hydrogen
  3. calcium
  4. magnesium
Answer and Explanation :-

Answer: Option 3

Explanation:

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Adversity, if for no other reason, is of benefit, since it is sure to bring a season of sober reflection. People see clearer at such times. Storms purify the atmosphere.
-Henry Ward Beecher