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[A] : A complete double circulation occu...

[A] : A complete double circulation occurs in birds for the first time.
[R]: At no point is there any opportunity for oxygenated and unoxygenated blood to mix.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

Text Solution

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The correct Answer is:
A
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