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

A collapsing nebula leads to nuclear fusion process.
A collapsing nebula leads to what process?

Most of the digestion reactions occur in the small intestine.
Where do most of the digestion reactions occur?

In relation to electrical current, a narrow wire will have more resistance than a wide wire.
In relation to electrical current, what property will a narrow wire have more of than a wide wire?