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

Radioactive decay can give off energy and particles.
Radioactive decay can give off energy and what else?

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

The process responsible for the presence of oxygen in our atmosphere is photosynthesis.
What's the process responsible for the presence of oxygen in our atmosphere?