Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Q: The pressure of a sample of gas is measured with an open-end manometer.

A: The pressure of a sample of gas is measured with an open-end what?
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Q: Reptiles typically reproduce sexually.

A: How do reptiles typically reproduce?
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Q: Drought makes marginal lands unsuitable for farming.

A:
What makes marginal lands unsuitable for farming?
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