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

Q: Axillary buds in the axils of leaves and stems give rise to branches.

A: What in the axils of leaves and stems give rise to branches?
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Q: Chemical digestion mainly occurs in the small intestine.

A: Where does chemical digestion mainly occur?
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Q: Alkenes with the same atoms but different shapes are called isomers.

A:
Alkenes with the same atoms but different shapes are called what?
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