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Which two of the following changes (i-iv...

Which two of the following changes (i-iv) usually tend to occur in the 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

A

a and b

B

b and c

C

c and d

D

a and d

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