Multiple choice

Number of red blood cells per unit volume of blood is likely to be higher in a person living at higher altitudes because at higher altitudes

  1. air is clean and unpolluted

  2. more sunlight is available

  3. air is less dense

  4. vegetation gives out more oxygen

  5. people need more oxygen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Air pressure gets reduced at height which  increases  the RBC production.

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