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: The Obama administration is developing additional screening protocols for airline passengers both overseas and in the United States to control infectious diseases such as Ebola, President Barack Obama said Monday .<sep>Span: Obama administration
Example output: What was the duration of the Obama administration?
Example explanation: It is an inquisitive question based on the specific span of the sentence.
Q: Sentence: A number of plants and animals threatened by souring seas , including some mussels , abalone , rock oysters , plankton and even a few fish , appear likely — at least at first — to adjust or evolve .<sep>Span: souring seas ,
A:
What is a souring sea?