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: The sun is considered the center of the solar system.

A: What is considered the center of the solar system?
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Q: A gas assumes the shape of its container.

A:
Which form of matter assumes the shape of its container?
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