Diane Dodd's experiments using fruit flies demonstrated that

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Diane Dodd's experiments with fruit flies showed that if two populations experience different environmental conditions and adapt to them, the likelihood of the formation of a reproductive barrier between them increases. This suggests that reproductive barriers can evolve relatively quickly, as observed in the laboratory setting. The other choices are incorrect because reproductive barriers are not usually absolute, they can evolve at different rates, and the evolution of new reproductive structures is a more complex process that can take multiple generations to occur.

Diane Dodd's Experiments Using Fruit Flies Demonstrated That