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

Which two of the following changes (A-D) usually tend to occur in the plane 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 Changes occurring are:

A

(B) and (C)

B

(C) and (D)

C

(A) and (D)

D

(A) and (B)

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