(i) To increase the surface area for efficient transport/increase efficiency of delivery of oxygen; (to tissue)
(ii) At high altitude air is less dense/partial pressure of oxygen is low/there is low concentration of oxygen, hence the number of red blood cells/structure C increases to increase oxygen carrying capacity of blood;
(iii) Phagocytosis;
sharon kalunda answered the question on May 28, 2019 at 05:26
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