Oxygen in nitrogen is an example of a gas-gas solute-solvent combination.

Here's why:

* Solute: Oxygen (O2) is the dissolved substance. It's present in a smaller amount than the solvent.

* Solvent: Nitrogen (N2) is the dissolving substance. It's present in a larger amount and forms the continuous phase.

Both oxygen and nitrogen are gases at room temperature and pressure, making this a gas-gas solution.