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

[Q]: Socket secures teeth in the mouth.
[A]: What secures teeth in the mouth?


[Q]: In their processes of gene expression, archael cells seukaryotic similarties to both bacterial cells and which other type of cell.
[A]: In their processes of gene expression, archael cells show similarties to both bacterial cells and which other type of cell?


[Q]: Nuclear fusion, which results because of great pressure at the center of a star, causes stars to shine.
[A]:
What process, which results because of great pressure at the center of a star, causes stars to shine?