Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.

Q: Fact: studying a soil sample means studying the microorganisms in that soil

A: studying a soil sample means studying the microorganisms in the?
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Q: Fact: as air pressure decreases , the chance of rain will increase

A: The pressure in air drops very low, so clouds?
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Q: Fact: a tree is a source of food for birds in an ecosystem

A:
Jays find nutrition in?
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