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

Example Input: 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
Example Output: Why are sea urchins known as hedgehogs of the sea?

Example Input: Sentence: For one , there ' s red curry and other Thai food .<sep>Span: other Thai food
Example Output: What kind of Thai food?

Example Input: 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
Example Output:
What would be needed to prove the findings?