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

Q: Most of the digestion reactions occur in the small intestine.

A: Where do most of the digestion reactions occur?
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Q: Gravity makes soil and rock particles move gradually down the slope during each thaw.

A: What makes soil and rock particles move gradually down the slope during each thaw?
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Q: The electrode at which reduction occurs is called the cathode.

A:
What is the electrode at which reduction occurs called?
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