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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

(b) and (c)

B

(c) and (d)

C

(a) and (d)

D

(a) and (b)

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The correct Answer is:
A
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