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[A] : In elastic lungs of birds are supp...

[A] : In elastic lungs of birds are supplemented by remarkable system of air sacs .
[R] : Air sacs function in storage of food .

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

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