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

Q: Line graphs are especially useful for showing changes over time.

A: Line graphs are especially useful for showing changes over what?
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Q: All cells have the small size in common.

A: What do all cells have in common?
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Q: The pituitary gland is in the brain.

A:
Where is the pituitary gland?
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