Sentence Completion
Verbal Ability

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Biological clocks are of such ____ adaptive value to living organisms, that we would expect most organisms to ____ them.


meager - evolve


meager - evolve


significant - eschew


obvious - possess

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Option(D) is correct

The sentence structure suggests that if biological clocks are a great advantage, then most organisms would possess them. [Or, if they are not an advantage, then organisms will not have them.]
Therefore, the obvious value, leads us to expect that organisms possess them.

(meager = small, slight; eschew = shun, avoid; ambivalent = ambiguous)

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