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: a stem is a source of support for a plant

A: You might support a growing tomato plant with?
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Q: Fact: a renewable resource can be replaced

A: Which of the following is the most replaceable?
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Q: Fact: a plant absorbs carbon dioxide from the air for photosynthesis

A:
Trees take in CO2 from the atmosphere for?
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