Write an inquisitive question about a specific text span in a given sentence such that the answer is not in the text.

Q: Sentence: The findings also suggest but don ' t prove that the tribes may have been right about Kennewick Man all along .<sep>Span: suggest but don ' t prove that

A: What would be needed to prove the findings?
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Q: Sentence: Like Darwin ' s finches or Great Britain ' s peppered moths , these hedgehogs of the sea increasingly embody nature ' s stunning capacity for resilience .<sep>Span: hedgehogs of the sea

A: Why are sea urchins known as hedgehogs of the sea?
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Q: Sentence: But these lowly sea urchins adapt so quickly they ' re helping answer a question that ' s key to understanding ocean acidification : As fossil - fuel emissions disrupt marine life , will evolution come to the rescue ?<sep>Span: ocean acidification :

A:
What is ocean acidification?
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