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

[Q]: Exotic species are also called invasive species because they threaten other species.
[A]: Why are exotic species also called invasive species?

[Q]: Diffusion is the term for the movement of molecules from an area of high concentration to an area of low concentration.
[A]: What is the term for the movement of molecules from an area of high concentration to an area of low concentration?

[Q]: Nitrogen and oxygen forms as a result of decomposition when n2o is heated.
[A]:
What forms as a result of decomposition when n2o is heated?