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Assertion (A) The establishment of reproductive isolation is an event of biological significance.
Reason (R) In the absence of reproductive isolation, species can merge back into single population.
(a) Both \( \mathrm{A} \) and \( \mathrm{R} \) are true and \( \mathrm{R} \) is the correct explanation of \( \mathrm{A} \)
(b) Both \( \mathrm{A} \) and \( \mathrm{R} \) are true, but \( \mathrm{R} \) is not the correct explanation of \( \mathrm{A} \)
(c) A is true, but \( R \) is false
(d) Both A and \( \mathrm{R} \) are false
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