* Solution: A solution is a homogeneous mixture where one substance (the solute) is dissolved evenly throughout another substance (the solvent).

* Heterogeneous: A heterogeneous mixture has components that are not evenly distributed and can be easily identified.

In soda:

* Solute: Sugar, flavorings, and carbon dioxide gas

* Solvent: Water

The sugar, flavorings, and carbon dioxide are dissolved in the water, forming a uniform mixture. You can't easily separate the components of soda by simple means.

Therefore, soda is a homogeneous mixture, specifically a solution.