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

Example Input: In their processes of gene expression, archael cells seukaryotic similarties to both bacterial cells and which other type of cell.
Example Output: In their processes of gene expression, archael cells show similarties to both bacterial cells and which other type of cell?

Example Input: A visual "copy" of an object that is formed by reflected or refracted light is called image.
Example Output: A visual "copy" of an object that is formed by reflected or refracted light is called what?

Example Input: Metalloids is the smallest class of elements.
Example Output:
What is the smallest class of elements?