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  1. If a person who lives at a low altitude moves to a higher altitude, changes occur in his blood consumption. Name two of these changes.
  2. State the importance of these changes. 

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  1. An increase in amount of haemoglobin, an increase in the number of red blood cells;
  2. To increase the surface area for transport of oxygen/to increase the volume of oxygen in the body/to trap more oxygen
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