Which of the following is the main constituent of haemoglobin?

Options :
  1. Iron
  2. Magnesium
  3. Calcium
  4. Chlorine
Answer and Explanation :-

Answer: Option 1

Explanation:

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There is a saying in Tibetan, 'Tragedy should be utilized as a source of strength.'No matter what sort of difficulties, how painful experience is, if we lose our hope, that's our real disaster.
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