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[A] : In a food chain , membrane of succ...

[A] : In a food chain , membrane of successive higher levels are fewer in number .
[R] : Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level .

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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