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Statement (S) : Populations of a species inhabiting different geographical areas are in a continuous process of adaptation to their surrounding environments and this leads to the evolution of a new species. Reasons (R) : Geographical barriers obstruct interbreeding of populations of a species leading to reproductive isolation and evolution of new species.

(1) Both (S) and (R) are not true.

(2) Only (S) is true but not (R)

(3) Both (S) and (R) are true but (R) does not explain (S)

(4) Both (S) and (R) are true and (R) is correct explaination to  (S)

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