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[A] : A species is an interbreeding popu...

[A] : A species is an interbreeding population which is reproductively isolated from other similar but morphologically distinct populations .
[R] : Each species has its own niche which is not utilized exactly by another species .

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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