Please submit your concern

Explanation:

Option 1 – that gene flow contributes to evolutionary divergence is a correct statement. It is stated towards the end of the first paragraph that “without the separation, gene flow was relentless” and contributed to the evolutionary process. Eliminate option 1 because this is an EXCEPT question. Option 2 is correct. The Population Bomb was published in 1968 and the challenge to the theory about the diversity within a species had happened in mid 1960s. This is stated in the second paragraph. Also, species diversity and diversity within a species are different ideas. Thus option 2 is not correct. Retain option 2.
Option 3 is incorrect. The first paragraph states, “Scientists have long recognized the incredible diversity within a species … they thought it reflected evolutionary changes that unfolded imperceptibly, over millions of years.” It was thus known that evolutionary changes were slow and happened over millions of years, though the writer points out that diversity within a species may not be as thought earlier. Eliminate option 3.
Option 4 is incorrect. The study conducted by Ehrlich and Raven showed that checkerspot butterflies exhibited speciation while living in close proximity. Eliminate option 4.
Hence, the correct answer is option 2.

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