[Q]: Sentence: In Chapter II, Darwin specifies that the distinction between species and varieties is arbitrary, with experts disagreeing and changing their decisions when new forms were found. Question: What did Darwin and Wallace make central to understanding the natural world?
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[A]: no

[Q]: Sentence: Ideally, this plan would benefit from the opening of a second front on Philip's eastern frontiers with Flanders and Boulogne effectively a re-creation of Richard's old strategy of applying pressure from Germany. Question: John focused on trying to retake what?
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[A]: no

[Q]: Sentence: It became one of the most important metals to the ancients. Question: Which metal important to the ancients is the hardest one?
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[A]:
no