People who live at high altitudes have rosy cheeks because Biology - Questions and Answers

People who live at high altitudes have rosy cheeks because

(a)Fed cell concentration becomes considerably above the average in response to lowered oxygen pressure Right sign

(b)The rate of capillary circulation increases in the skin to make it look pinkish

(c)Haemoglobin has an increased binding affinity for Oxygen to become deep red in colour

(d)All of these

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