TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: A theory is another name for a broad explanation that is supported by a great deal of evidence.

SOLUTION: What is another name for a broad explanation that is supported by a great deal of evidence?

PROBLEM: Exotic species are also called invasive species because they threaten other species.

SOLUTION: Why are exotic species also called invasive species?

PROBLEM: In their processes of gene expression, archael cells seukaryotic similarties to both bacterial cells and which other type of cell.

SOLUTION:
In their processes of gene expression, archael cells show similarties to both bacterial cells and which other type of cell?