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Which two of the following changes (A-B)...

Which two of the following changes (A-B) usually tend to occur in the plain dwellers when they move to high altitudes (3500 m or more )
(A) Increase in red blood cell size
(B) Increase in red blood cell production
( C) Increased breathing rate
(D) Increase in thrombocyte count

A

a and b

B

b and c

C

c and d

D

a and d

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