Which two of the following changes ((i) to (i | vedclass

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(A) When people from low-altitude regions (plain dwellers) move to high altitudes ($3500 \ m$ or more),they experience altitude sickness due to low at

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$(ii)$ and $(iii)$

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(A) When people from low-altitude regions (plain dwellers) move to high altitudes ($3500 \ m$ or more),they experience altitude sickness due to low atmospheric pressure and low oxygen availability.To compensate for the low oxygen levels (hypoxia),the body undergoes physiological acclimatization:$1$. The breathing rate increases to intake more oxygen from the thin air.$2$. The production of red blood cells (erythropoiesis) increases to enhance the oxygen-carrying capacity of the blood.Therefore,the correct changes are $(ii)$ and $(iii)$.

Which two of the following changes $((i)$ to $(iv))$ usually occur in plain dwellers when they move to high altitudes ($3500 \ m$ or more)?
$(i)$ Increase in red blood cell size
$(ii)$ Increase in red blood cell production
$(iii)$ Increased breathing rate
$(iv)$ Increase in thrombocyte count

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Which two of the following changes $((i)$ to $(iv))$ usually occur in plain dwellers when they move to high altitudes ($3500 \ m$ or more)?$(i)$ Increase in red blood cell size$(ii)$ Increase in red blood cell production$(iii)$ Increased breathing rate$(iv)$ Increase in thrombocyte count