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Since mature red blood cells do not contain a nucleus, more room is available for
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Answer:

The correct answer is : oxygen

Explanation:

  • Oxygen is carried in the blood by two means:
  1. About 2% of the oxygen is carried in the dissolved form in blood plasma and in the water present in the red blood cells (RBCs).
  2. Rest 98% of the oxygen is carried in bound form with the haemoglobin as oxy-haemoglobin inside the RBCs.
  • RBCs lack nucleus. This place is occupied by hemoglobin molecules that  binds to oxygen and form oxy-hemoglobin.
  • This increases the capacity of each RBC so that it can carry more oxygen to all the parts in the body.

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