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Which two of rhe following changes (1-4) usually tend to occur in the plain dwellers when they move to high altitudes (3,500 m or more)?

(1) Increase in red blood cell size

(2) Increase in red blood cell production

(3) Increased breathing rate

(4) Increase in thrombocyte count Changes occurring are

(a) (2) and (3)

(b) (3) and (4)

(c) (1) and (4)

(d) (1) and (2)

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