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Which statement concerning the ultimate fate of the Neanderthals is supported by information in the passage?
The passage does not definitely assert that the hybridization theory is superior to the replacement theory, but merely suggests that the hybridization theory may draw support from new evidence. We can infer that the hybridization theory may yet prove to be the superior one in the future, but not that it is definitely so at this point.
The passage does not state that there will be an end to speculation, but rather that there currently is much speculation on this topic
The passage does not discuss interaction between Asian and European Neanderthals, i.e. two sub-groups of Neanderthals, but rather relations between early humans and Neanderthals.
The passage tells us that the replacement theory proposes that Neanderthals were either violently displaced or out-competed by the Neanderthals, but it does not assert that this indeed was the cause of the Neanderthal's extinction.
The passage tells us that there is much speculation (=imaginative interpretations) on the topic of Neanderthal extinction. It also tells us that evidence may challenge or support these speculations, but it does not tell us that the problem has been definitely resolved by science.